Windows: Looking to stash some files out of sight? PenyuLocker camouflages your folder as a functional Recycle Bin.
It's not exactly nested Truecrypt volumes but PenyuLocker is a novel data-obfuscation tool. Point PenyuLocker at a folder and lock it, it swaps the folder's icon with the icon of the Recycling Bin and anyone who clicks on the folder is taken to the Recycling Bin for that drive. Placing the folder on the desktop and labelling it "Recycling Bin" would seem to be an ideal spot to camouflage it. Run the application again, enter the password you assigned to the folder, and reverse the process to access your files.
Penyulocker is freeware, Windows only. Have a favourite tool for stashing data? Let's hear about it in the comments.