haha
so do i, a great deal more. the macbook air is never going to help with video rendering, motion tracking, chroma keying, encoding, heavy photoshop use (although basic stuff it'd be fine for)
but when your tweaking code, prototyping a css template or just brining a project to a client for inspection, you rarely need that meat
and believe me, i have held one, you really wouldnt mind having it with you 100% of the time, it ways nothing!!