I like Live Mesh, because I don't have to carry my files around on a USB drive. But today while I tried to install it on my Netbook which is running on Windows XP, I found actually I couldn't do it:
Windows Live Mesh 2011: "Windows Live Mesh is only available for Windows 7 and Windows Vista."
Live Mesh can sync my files between my Vista and Mac, but not this one.
Another drawback is that I can't install live mesh on my Office computer without administrator account.
I have heard about dropbox and using Google Docs and other similar things. Google Docs can syn with my local files, and I will not try dropbox in near future.
There are no perfect things in the world. I still have to carry my usb drive sometimes.