This is actually already partially implemented. If you insert a snippet that includes a method/class (e.g. search for "screenshot"), a comment uniquely identifying the snippet is included in the inserted code. We currently aren't inserting these comments for the smaller snippets because we thought it would be annoying (but we could implement an option to enable it). It would be pretty easy (once versioning is up and running) to notify programmers when newer versions of the identified snippets are available.
