I have created a wiki page for Project Management under TM2, you can find it here:
http://wiki.macromates.com/Suggestions/ProjectManagementInTextMate2
I wrote Project Management rather than Projects since Allen does not intend to add projects to the 2.0 release (and quite possibly also not at a later date). So my intention was to collect
(1) suggestions on how to improve the file pane, (2) how to replicate/adapt the workflow for people who have previously used projects and (3) reasons why the filesystem-centric approach is not suited to meet their needs.
I'd be happy if other people contribute and add suggestions. Perhaps it can become a handy tool for Allen to collect useful feedback.
Max