> Any adventurous folks out there know of a free or at least extremely cheap > source for zip code lookups (to long/lat coordinates)? Since I'm working on > free census data some newer zipcodes aren't in my system.
How about Street Atlas? Easy to use (and cheap if you already own it -- not that bad if you don't). Is it up to date enough?
> A bonus would be an area code/longitude-latitude lookup database.
Well, you've got that -- and an exact map of what the zip code covers.