This is for those who want to run Dropbox without needing to install it (example: Running it on your USB stick – U3 included)
Makes Dropbox compatible with any USB flash drive (compatible with 0.8.X versions of Dropbox) and has some nice features. Because it requires .NET Framework 3.5 it will not work on most of public PCs with installed Windows XP but only on Vista and 7.
By: Filipe F
.NET Framework 3.5
Support thread & download link (forum)