I, too harbored deep suspicions about iStat 2's resource usage, but version 3 seems to be much better behaved, so I have no regrets paying for the upgrade.

(OTOH, I have 8GB of RAM now, so I'm less likely to notice these problems, even with a few dozen tabs open in Chrome, plus Safari, Mailplane and Firefox, not to mention my VMware XP machine running all the time. The thought of a 16GB iMac makes me drool.)

My current uptime is 36 days and SystemUIServer is using only 53MB of real memory, which seems reasonable with all the other menu thingies I have (it's a constant struggle weighing their relative merits against available screen space). But I'll keep this hint in mind if I see it creeping into the stratosphere. I like easy fixes. :)

Now, if only kernel_task could be reset without disrupting the whole boat...