It appears that the method name autocomplete could be smarter in a few cases. For example, if I type "[myObject rel", I'd expect it to pick "release" first. Instead, with an NSMutableArray*, it picks removeLastObject, and doesn't even give 'release' as an option until I type more. Similarly with '[myObject au', I'd expect it to pick "autorelease", but it chooses something funky like "autoContentAccessingProxy", and has "autorelease" as the second suggestion.
Very nice job overall. It's more pleasant to use the Xcode at this point.