My affinity for bouncing between different paritions on my desktop, different partitions on my laptop and my tablets used to create headaches both minor and major before I found the magic of Dropbox. I had read a couple things in passing that suggested installing it on Gentoo might present some problems (like everything else involved in Gentoo) but the process was painless. I tried the advice the good Mr. Johnson gave on his blog to just use the official dropbox Linux tarball and set its daemon to run at every boot yourself. Works like a charm. I didn’t try emerging it from Gentoo’s ebuilds so don’t know how well they do or don’t work.
Dropbox on KDE Gentoo: Pretty Damn Painless