For general use, sure. It'll run iCal and such things, it should be fine. Max out the RAM, that will help a lot. It's more or less a goner for Flash, but for everything else you should be OK.
The last gen 1.33 and 1.42 will take 1.5gb of memory and have better graphics cards. Which one do you have? And like previously stated, they will be nice machines if you don't have high expectations. Web browsing and SD movie watching are it's best points. And the 12" portability is also great too(1.42 was 14" only).