Sometimes people put together some useful, if perhaps odd, guides.

Applescript for Python Programmers is a set of tables mapping Python syntax, functions, and interfaces to the equivalent Applescript. Actually pretty nice for understanding both languages.

Are there others out there like this? Particularly I would think the following would be particularly useful:

• C++ < -> Obj-C
• Javascript < -> PHP < -> Perl
• HTML < -> XML/XSLT