This forum needs more filters. (or maybe i'm just blind xD )
I can't trace any thread i was discussing in if i don't write down the exact title, and that's not really the way a forum should work, no? ;)
I'd opt for an own tab called "my threads", showing all the threads you were participating in. Like that, you can keep track on interesting threads without having the memory of a giant. ;)
Thnx,
Holz