Base is younger than your question, and definitely feels like a 1.0, but the user experience is miles better than the experience of using any of the “cross-platform” apps on a Mac.
http://menial.co.uk/software/base/
I recommend you buy a license before the developer realizes he is charging too little for it.
UPDATE: Since December 2008, Base is now up to version 2.1, it has become an excellent product. I don’t remember what it used to cost, but I paid for the 1.x to 2.x upgrade. Still highly recommended.
ANOTHER UPDATE: Base is available on the Mac App Store, you may find it useful to read the reviews there.