There's a straightforward way to use Services to open files and folders in Sublime from the contextual menu in the Finder. (This same tip with a little tweaking likely applies to anything else you want to open things in.)
By Matthew Malinowski, 2012-11-30
Jeffrey Way's got a good video series called Perfect Workflow in Sublime Text 2 that I'm working through now to pick up some tips.
In his third video, "Services and Opening Sublime From the Terminal", Jeffrey explains how to add an "Open in Sublime" command to the Services contextual menu in the Finder. (This makes it easy to open files and projects in Sublime from the Finder.)
It's a good tip, but he makes one mistake. Here's how to do it:
/Applications/Sublime\ Text\ 2.app/Contents/SharedSupport/bin/subl -n $@. (This is just the default location of the Sublime executable.)