Also, you can install is to memory stick and use it everywhere.

IMHO Eclipse is great for Java, good for C++ and OK for PHP. But the main reason I use it is its UI consistency. Once you learn to use it it doesn't matter in what language you working on, so using it in a new language has almost zero learning curve.

Also it makes it easy to work on different projects in different languages at the same time - a blessing with applications that use both python and C++ code for example.