D&D 3E/3.5 PHB DMHB & MM List of changes 3.0 to 3.5

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Well, that last site lists all the changes in the first two books. No one's forcing you to play 3.5, though.

If you know 3.0 pretty well, most of the concepts haven't changed. The mechanics have changed a little. One of my DMs incorporated the 3.5 rules bit by bit so it didn't seem overwhelming.

That site Jdvn1 linked above is the best resource I've found yet. It really is a huge document, though. You'd probably be better off just downloading the 3.5 SRD. But scanning through the revision document will help point out the changes.

The most common misconception I've run into is that the 3.5 revision only changed a few things from 3.0. We also began incorporating the changes bit by bit. I kinda wish we had just changed everything at once, as I'm still running across spells and items that were changed.