On 29/08/2005, at 0.21, Michael Sheets wrote:
~/Library/Application Support/TextMate/ TextMate.app/Content/SharedSupport/ /Library/Application Support/TextMate/
For just about any OSX application it will look inside the application first, then the root Library, then the user level Library.
Other way around, first it looks in personal library, and stuff there takes precedence over the global library which takes precedence over the application provided.
As for multiple copies of the same bundle, I am not sure on what level TextMate merges stuff (if it does; I think it doesn't, currently).
-- Sune.