I actually often use Java style: PascalCase for type names, camelCase for functions and variables, CAPITAL_WORDS for preprocessor macros. I prefer that over the Boost/STL conventions because you don't have to suffix types with _type. E.g.
Size size();
instead of
size_type size(); // I don't like suffixes
This has the additional benefit that the StackOverflow code formatter recognizes Size as a type name ;-)