As of kernel 2.6.29.6-217.2.3.fc11.i586 and alsa-lib version 1.0.20-1, I am still seeing this (with pulseaudio). Output from /var/log/messages:

Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-sink.c: Increasing minimal late
ncy to 1.00 ms
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-sink.c: Increasing minimal late
ncy to 2.00 ms
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c: snd_pcm_avail() returne
d a value that is exceptionally large: 4294964340 bytes (24347870 ms).
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c: Most likely this is a b
ug in the ALSA driver 'snd_intel8x0'. Please report this issue to the ALSA devel
opers.
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c: snd_pcm_dump():
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c: Hardware PCM card 0 'In
tel 82801DB-ICH4' device 0 subdevice 0
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c: Its setup is:
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   stream       : PLAYBA
CK
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   access       : MMAP_I
NTERLEAVED
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   format       : S16_LE
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   subformat    : STD
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   channels     : 2
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   rate         : 44100
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   exact rate   : 44100 
(44100/1)
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   msbits       : 16
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   buffer_size  : 16384
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   period_size  : 16384
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   period_time  : 371519
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   tstamp_mode  : ENABLE
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   period_step  : 1
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   avail_min    : 16384
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   period_event : 0
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   start_threshold  : -1
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   stop_threshold   : 10
73741824
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   silence_threshold: 0
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   silence_size : 0
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   boundary     : 107374
1824
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   appl_ptr     : 770791
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   hw_ptr       : 753668
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c: snd_pcm_delay() returne
d a value that is exceptionally large: 349768 bytes (1982 ms).
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c: Most likely this is a b
ug in the ALSA driver 'snd_intel8x0'. Please report this issue to the ALSA devel
opers.
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c: snd_pcm_dump():
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c: Hardware PCM card 0 'In
tel 82801DB-ICH4' device 0 subdevice 0
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c: Its setup is:
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   stream       : PLAYBA
CK
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   access       : MMAP_I
NTERLEAVED
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   format       : S16_LE
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   subformat    : STD
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   channels     : 2
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   rate         : 44100
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   exact rate   : 44100 
(44100/1)
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   msbits       : 16
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   buffer_size  : 16384
Aug  9 11:22:29 localhost pulseaudio[2295]: alsa-util.c:   period_size  : 16384
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   period_time  : 371519
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   tstamp_mode  : ENABLE
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   period_step  : 1
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   avail_min    : 16384
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   period_event : 0
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   start_threshold  : -1
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   stop_threshold   : 10
73741824
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   silence_threshold: 0
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   silence_size : 0
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   boundary     : 107374
1824
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   appl_ptr     : 841351
Aug  9 11:22:30 localhost pulseaudio[2295]: alsa-util.c:   hw_ptr       : 753909

This happens always when I try to play something from youtube (sound disappear after a while). If I restart firerox and replay, the audio works again for a moment and then goes away (with the above messages in the syslog). I suppose that this is my audio card (from lspci):

00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)