I’ve been really addicted to Google offerings over the years. Google allows you to do some things you just can’t do any other way. Some examples are Gmail, Reader, and Voice.
I recently had the opportunity to convert a large-ish Movable Type system to WordPress for speed testing and usability evaluation. By “large-ish” I mean 12,038 posts, and 43,043 comments. This may not be large by others’ standards, but it was plenty large to me.