I rolled my own in F# (see this question), but it still isn't perfect (I just do regexps, so I don't recognise classes or method names etc.).
Basically, from what I can tell, the blogger editor will sometimes eat your angle brackets if you switch between Compose and HTML mode. So you have to paste into HTML mode then save directly. (I may be wrong on this, just tried now and it seems to work - browser dependent?)
It's horrible when you have generics!