What about Media Monkey? (If I am understanding your question correctly!) - Chris Norman

yes, thank you! - Juan Pablo

If you're looking for a simple portable player then VLC 1.0.0 just came out (along with a portable version). It's very light weight and runs many different kinds of media formats. I could be missing something, though. I'm not sure exactly what you need from iTunes. But Media Monkey could be a great alternative. - Nicholus

not sure what you're after - but I use floola, its an app that sits on your ipod & can be run from ipod when plugged into anyones computer & does the same basics as itunes - Steve