I've fixed this locally and will upload a fix shortly. The underlying cause of the update.py file trying to log appears to be an issue in the gnome-do.desktop file.
Output below (this output now replaces the original error):
2011-03-05 18:21:46,687 - softwarecenter.db.update - WARNING - error processing: /usr/share/app-install/desktop/gnome-do.desktop File contains parsing errors: /usr/share/app-install/desktop/gnome-do.desktop [line 12]: '\xd0\xb6\xd3\x99\xd0\xbd\xd0\xb5 \xd1\x82\xd0\xb0\xd2\x93\xd1\x8b \xd0\xba\xd0\xb5\xd0\xb7-\xd0\xba\xd0\xb5\xd0\xbb\xd0\xb3\xd0\xb5\xd0\xbd \xd0\xb1\xd0\xb0\xd1\x80 \xd0\xbd\xd3\x99\xd1\x80\xd1\x81\xd0\xb5\xd0\xbb\xd0\xb5\xd1\x80\xd1\x96\xd2\xa3\xd1\x96\xd0\xb7\xd0\xb1\xd0\xb5\xd0\xbd \xd0\xbc\xd2\xaf\xd0\xbc\xd0\xba\xd1\x96\xd0\xbd\xd0\xb4\xd1\x96\xd0\xb3\xd1\x96\xd0\xbd\xd1\x88\xd0\xb5 \xd0\xb6\xd1\x8b\xd0\xbb\xd0\xb4\xd0\xb0\xd0\xbc (\xd0\xb1\xd1\x96\xd1\x80\xd0\xb0\xd2\x9b \xd0\xb6\xd1\x8b\xd0\xbb\xd0\xb4\xd0\xb0\xd0\xbc\xd1\x8b\xd1\x80\xd0\xb0\xd2\x9b \xd0\xb5\xd0\xbc\xd0\xb5\xd1\x81) \xd0\xb6\xd2\xb1\xd0\xbc\xd1\x8b\xd1\x81 \xd1\x96\xd1\x81\xd1\x82\xd0\xb5\xd2\xa3\xd1\x96\xd0\xb7!\n'
I've fixed this locally and will upload a fix shortly.
The underlying cause of the update.py file trying to log appears to be an issue in the gnome-do.desktop file.
Output below (this output now replaces the original error):
2011-03-05 18:21:46,687 - softwarecenter. db.update - WARNING - error processing: /usr/share/ app-install/ desktop/ gnome-do. desktop File contains parsing errors: /usr/share/ app-install/ desktop/ gnome-do. desktop xd3\x99\ xd0\xbd\ xd0\xb5 \xd1\x82\ xd0\xb0\ xd2\x93\ xd1\x8b \xd0\xba\ xd0\xb5\ xd0\xb7- \xd0\xba\ xd0\xb5\ xd0\xbb\ xd0\xb3\ xd0\xb5\ xd0\xbd \xd0\xb1\ xd0\xb0\ xd1\x80 \xd0\xbd\ xd3\x99\ xd1\x80\ xd1\x81\ xd0\xb5\ xd0\xbb\ xd0\xb5\ xd1\x80\ xd1\x96\ xd2\xa3\ xd1\x96\ xd0\xb7\ xd0\xb1\ xd0\xb5\ xd0\xbd \xd0\xbc\ xd2\xaf\ xd0\xbc\ xd0\xba\ xd1\x96\ xd0\xbd\ xd0\xb4\ xd1\x96\ xd0\xb3\ xd1\x96\ xd0\xbd\ xd1\x88\ xd0\xb5 \xd0\xb6\ xd1\x8b\ xd0\xbb\ xd0\xb4\ xd0\xb0\ xd0\xbc (\xd0\xb1\ xd1\x96\ xd1\x80\ xd0\xb0\ xd2\x9b \xd0\xb6\ xd1\x8b\ xd0\xbb\ xd0\xb4\ xd0\xb0\ xd0\xbc\ xd1\x8b\ xd1\x80\ xd0\xb0\ xd2\x9b \xd0\xb5\ xd0\xbc\ xd0\xb5\ xd1\x81) \xd0\xb6\ xd2\xb1\ xd0\xbc\ xd1\x8b\ xd1\x81 \xd1\x96\ xd1\x81\ xd1\x82\ xd0\xb5\ xd2\xa3\ xd1\x96\ xd0\xb7! \n'
[line 12]: '\xd0\xb6\