We are currently using a Google Docs spreadsheet as our task tracker. At the meeting today, Brent, DD and I (Julie) agree to move it to the Miraheze MediaWiki, to move one step further away from Google. I've done so, at Task Tracker, but I think it will be too hard to use.
I'd love to hear from anyone who has any ideas of what other simple open-source software we could use for task tracking. I tried OpenOffice spreadsheets, but I'm not sure if everyone would need an account there, or just the document owner.