I have been using the Tracke2 beta for quite some time. One of the things that annoy me most is that I keep having to reset the number of items it displays per page. It keeps reseting to the default (?) of 10 per page, but I prefer 35 per page. It's a bit annoying to have to reset this every now and then (sometimes multiple times a day, sometimes after a couple days).
I am using Firefox 3.0.7 under Mac OS X (since SF.net is mostly unusable under Safari for me these days, but I already have SRs on that ;).