Secure USB Flash Drive

[~Craig~]

Have a look at the ByteStor ones these come with a decent password access app on them.

have a look at truecrypt too.

[tay]

Just send it to yourself... but make it recorded post.

[Tevh]

I recommend TrueCrypt ( http://www.truecrypt.org/ There are various encryption types all of which are extremely secure. A complete drive can be encrpyted or just a part and no info is stored on the host PC (everything is passed directly to RAM)
It's easy to setup and use, perfect for financial info or anything else.