Hm, for mails, I usually use IMAP or an web interface, so it doesn't really matter (for me) how/where there is a local cache in my file system. For music, pict

Hm, for mails, I usually use IMAP or an web interface, so it doesn't really matter (for me) how/where there is a local cache in my file system. For music, pictures and other stuff, I care and I want to be able to use different tools and switch between them on the same set of media. This is why I disabled all the automatic management, e.g. in iTunes or iPhoto and just move the files around manually. It's because only this way, I have a sane and common way to find my media, no matter what application I am using. The same is for projects (source code, other stuff; I also sometimes switch between different IDEs/editors) and documents. And then there are contacts and dates. I haven't really found a good way yet to manage them as powerful as I want. Currently I use CalDAV and the like, all what GMail is offering me, so it is serverside just as mail. I guess to get all the possibilities I want, I also would need to have it just in my file system in some way.