Only in gwibber-2.91.91.1.mod: build
Only in gwibber-2.91.91.1.mod: debian
diff -ru gwibber-2.91.91.1/gwibber/microblog/plugins/twitter/__init__.py gwibber-2.91.91.1.mod/gwibber/microblog/plugins/twitter/__init__.py
--- gwibber-2.91.91.1/gwibber/microblog/plugins/twitter/__init__.py	2011-03-13 08:09:42.000000000 -0700
+++ gwibber-2.91.91.1.mod/gwibber/microblog/plugins/twitter/__init__.py	2011-04-01 09:31:47.000000000 -0700
@@ -74,18 +74,21 @@
   def _common(self, data):
     m = {};
     try:
+      tweetText = data["text"]
+      if "retweeted_status" in data:
+        tweetText = data["retweeted_status"]["text"]
       m["mid"] = str(data["id"])
       m["service"] = "twitter"
       m["account"] = self.account["id"]
       m["time"] = util.parsetime(data["created_at"])
-      m["text"] = unescape(data["text"])
-      m["to_me"] = ("@%s" % self.account["username"]) in data["text"]
+      m["text"] = unescape(tweetText)
+      m["to_me"] = ("@%s" % self.account["username"]) in tweetText
 
-      m["html"] = util.linkify(data["text"],
+      m["html"] = util.linkify(tweetText,
         ((util.PARSE_HASH, '#<a class="hash" href="%s#search?q=\\1">\\1</a>' % URL_PREFIX),
         (util.PARSE_NICK, '@<a class="nick" href="%s/\\1">\\1</a>' % URL_PREFIX)), escape=False)
 
-      m["content"] = util.linkify(data["text"],
+      m["content"] = util.linkify(tweetText,
         ((util.PARSE_HASH, '#<a class="hash" href="gwibber:/tag?acct=%s&query=\\1">\\1</a>' % m["account"]),
         (util.PARSE_NICK, '@<a class="nick" href="gwibber:/user?acct=%s&name=\\1">\\1</a>' % m["account"])), escape=False)
 
@@ -124,7 +127,9 @@
         m["reply"]["nick"] = data["in_reply_to_screen_name"]
         m["reply"]["url"] = "/".join((URL_PREFIX, m["reply"]["nick"], "statuses", str(m["reply"]["id"])))
 
-    m["sender"] = self._user(data["user"] if "user" in data else data["sender"])
+    if "retweeted_status" in data:
+        m["retweeter"] = self._user(data["user"] if "user" in data else data["sender"])
+    m["sender"] = self._user(data["retweeted_status"]["user"] if "retweeted_status" in data else (data["user"] if "user" in data else data["sender"]))
     m["url"] = "/".join((m["sender"]["url"], "statuses", str(m["mid"])))
 
     return m

diff -ru gwibber-2.91.91.1/ui/templates/base.mako gwibber-2.91.91.1.mod/ui/templates/base.mako
--- gwibber-2.91.91.1/ui/templates/base.mako	2011-03-13 08:09:42.000000000 -0700
+++ gwibber-2.91.91.1.mod/ui/templates/base.mako	2011-04-01 09:32:36.000000000 -0700
@@ -198,6 +198,9 @@
   % if data.get("reply", {}).get("nick", 0):
     <a href="${data['reply'].get('url', '#')}">${_("in reply to")} ${data['reply']['nick']}</a>
   % endif
+  % if data.get("retweeter", {}).get("nick", 0):
+    <a href="${data['retweeter'].get('url', '#')}">${_("RT by")} ${data['retweeter']['nick']}</a>
+  % endif
 </%def>
 
 <%def name="sender(data)" filter="trim">