That would certainly speed stuff up but then if someone puts their mouse over the link and clicks "bookmark this link" they don't get the pretty URL.
They'll only get the pretty URL if they open the link.
Is this acceptable? What do other people think? If so I'm sure you could implement it quickly and it's very easy to test so it could be easily put into 5.0...
(I think we're looking at another beta at the end of the week or Monday then a shot at a release candidate the week after, with luck)
