MacVim Snapshot 51 is Out
Today I saw that Björn was able to release MacVim Snapshot 51 with a lot of additions - including a Core Text renderer that should be the fastest way to render text on the Mac in Leopard (and Snow Leopard). While I haven't seen a lot of lagging rendering, it's always nice to see the best you can see when you're hoping around and scrolling in an editor - like Vim.
Again, Vim is probably my favorite tool for working with text, and MacVim is an excellent port to the Mac. It's really something you have to try.