Came across a website today called DevCheatSheet that contains a nice compilation of quick references for just about any language (and more) you can think of including: programming, scripting, markup, databases, version control, servers, ORM, blogs, websites, text editors and many other miscellaneous application.

Although fairly comprehensive there are missing pieces. I noticed Team Foundation Server (TFS) was missing from version control and Entity Framework (EF) was missing from ORM. Regardless should be a good place to find a reference for that language that you rarely use and need to remind your self of the syntax for.