I agree with the point about how projects not being ported to 1.9 begin to look unmaintained. It's been 3 months in stable now, and a year of betas before that - I can't help but start thinking any project not moving as fast as possible towards compatibility might not be one anyone should be relying on.
Most unforgivable offenders: Mongrel and the DB libraries
Most pleasant surprise: RMagick!