Pololu do a series called Orangutan which are mainly based on AvR168 (like AtMega8 but more RAM). These do, or dont, come with stuff like LCDs, switches etc depending on your budget. In particular they come with 2 H-Bridges which are great if driving DC motors rather than servos.
Having said all that: I haven't used them yet ! But will be doing in the near future - they look like good value.
Am sure others will prove me wrong