Plug-ins
Is there some functionality you miss? Vim has a lot of plug-ins which provide extra functions. On this page some useful plug-ins will be presented.
Supertab
Tab completion is a nice feature. With this plug-in you can complete what you are writing. It will recognize words in your current projects and provides them as suggestions when you press <TAB>.
Nerdtree
To be able to browse and open files in an easy manner is a nice feature when working with projects. The plug-ins Nerdtree provides you with a small window, which attaches to the left of your editing area. There you can choose the files to open and browse through the directory structure.
The are a lot more plug-ins available. A list of can be found on Vims homepage.