http://isc.sans.org/diary.html?storyid=2403 explains Firekeeper, an IDS/IPS Firefox browser plugin.
I'm running it on two machines that run Slackware (versions 11.0 and 12.0). I may throw it on my work machine (which runs Windows XP), but that may be a bit daring.
Firekeeper's homepage is at http://firekeeper.mozdev.org/installation.html
Please share your experiences with this plugin...this is a great idea and may be a Holy Grail for malware that infects via browsers.
Also, I've found what may be a good security site, http://www.megasecurity.org/Main.html. It may take me awhile to read, as it has tons of data, it seems.