UPDATE: I discovered that Buzzbird is free and it's answered all my prayers about being good, low-memory and such. My question has been answered. Thanks to splitpea for the notice. I've searched around for ages, and I've yet to find that perfect one. Tweetdeck is infamous for leaking memory, as is Twhirl. Spaz does the same, and dashboard based ones (like chirp, which I currently use) are a bit too bare-bones. DestroyTwitter looks quite good, though. Any recommendations? While platform is irrelevant, AIR-based clients always seem to be the worst offenders.