I originally installed GetBundles using Trey Piepmeier's instructions. Afterwards, I installed all TextMate bundles using GetBundles. I noticed that my copy of GetBundles was old, so I did the following:
cd ~/Library/Application Support/TextMate/Bundles/
svn co http://svn.textmate.org/trunk/Review/Bundles/GetBundles.tmbundle/
When I restarted TextMate and opened GetBundles, a dialog box popped up asking me to select the source for many—if not all—of my bundles. I can't remember which version of the Django bundle I installed or numerous others.
Is there anyway to update GetBundles without having it lose its head on the sources?
Yes, in TextMate click Bundles->GetBundles->Edit Preferences File. Either copy the data or back up the file to another location. Then update GetBundles. Now, select Edit Preferences File again, and paste that info back in. That should update the GetBundles bundle while maintaining its own data about which bundles you have installed.
Here are a couple sample lines from mine:
0B296803-7D51-11D9-859D-000D93B6E43C
https://github.com/textmate/todo.tmbundle/tarball/master
0D39D7BD-CD02-48EF-BB9C-2210BFFC5AD7
http://svn.textmate.org/trunk/Bundles/CTags.tmbundle
385A8908-0733-408E-AFA5-9576D2E3A16B
https://github.com/textmate/mail.tmbundle/tarball/master
4675A940-6227-11D9-BFB1-000D93589AF6
https://github.com/textmate/c.tmbundle/tarball/master
As you can see, it keeps track of the repository info, etc. The file itself is com.macromates.textmate.getbundles.plist and is located in ~/Library/Preferences.
I hope this helps.