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Projects just got the ajax treatment, and seems to be working great. Try it and see.
I'm testing out ajax favorites on MeFi right now (only www.metafilter.com). If you open any thread you can add the post or any comment as a favorite without leaving the page. Lemme know if you hit any snags and please hold off on "but, but, can you also make it do x?" requests until we're sure it works in most all browsers.
FYI: the tabs on mefi, metatalk, and ask mefi are no longer ajaxy, loading whole pages instead. They all have permanent easy to read URLs and your back button works again.
I'm testing out a new ajaxy spellchecker here on MetaTalk for the next couple days. Let me know if you find it better/more useful/buggy. If all goes well, it could be carried over to every textarea on the server.