I don't use OMFs much any more unless it's strickly an Avid>Pro Tools transfer. I do use XML filetypes with Final Cut Pro and MXF files which are generated by the Panasonic P2 cameras. The benefits of both are that they comtain more metadata and will hopefully be implemented by a large group of manufacturers (I guess we'll see at NAB).
I'm not sure about AAFs - although I see so many different filetypes I'm not sure what some of them are.
System Info - G5/Dual 2 - 10.4.8 - QT v7.1.3 - 8GB ram - Radeon 9800Pro - External SATA Raid - Decklink Extreme - Wacom 6x8