I just saw the Bjork explains TV video the other day for the first time. Wiig's pretty spot-on, but so much less adorable than the real thing.
Speaking of comediennes you like, did you know that Maria Bamford has a fairly regular spot on the ridiculously bad Tim & Eric Awesome Show Great Job!? (Well, I find it to be not very good, I must say, but there's only so much on at 1 in the morning.)She's a cat lady person.And fairly funny in comparison to the aforementioned Time & Eric.