Ajax
Anil Dash lists the items of a truly Web 2.0 service »
Which is funny, not least because TypePad only really has the REST API on his mock checklist (in fairness, LiveJournal, with tags and Ajax, comes closer).
Open-source PHP framework for creating AJAX applications »
In other words, Drupal doesn't have to re-invent the wheel (no idea if Apache License 2.0 is compatible with GPL, though).
Sproutliner, web-based outliner in Ajax »
Lot of potential. If only I did stuff like that in a browser.
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