Kept the same one for years, had one for awhile mocking Trader_Jorge, got my politico up about the war, and then changed it back to the original when I read this thread.
I've changed mine probably about every other month or so... one long spell in there or two when I was basically a no show... I like the last part of my sig now though... I'll probably keep it... Oh, and I like that Firefox guy's sig...
I changed mine a couple years ago to reflect the truth of the 2006 QB draft class and someone (I think Swolly-D) actually mentioned my old one. I didnt think anyone actually paid attention to these things.
I alter mine here and there. I am keeping that link to the HSM thread. I might bring some old school back.
I don't know if it's still useful to everyone, but a few years ago, I added all the links in my sig b/c of how many spyware threads there were. I've just kept them there.
Your sig has been useful to me on a few occasions especially after a reformat -- you should add CCleaner to the list.
I've changed mine 3 times in the since I joined, once was a maths question, the second was something I can't remember, and the current one is something thtat I hope the Rockets can maintain.