Check out this 2GB memory card that is the size of a credit card. You could easily store critical office data on the card and then carry it in your wallet just like a credit card. The data could be used as a second off site back up that is always with you.
It would also be a great way to transfer images or a patient record to a colleague you are meeting for lunch, or carrying around any data you want to keep safe and handy.

Wallet Flash Drive the size of Credit Card 128 MB to 2GB
Wallet Flash Drive the size of Credit Card 128 MB to 2GB on L Gadgets [1].

[1] http://www.lgadgets.info/wallet-flash-drive-the-size-of-credit-card-128-mb-to-2gb/

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The following comes from the digimemo web site here [1]. This looks like a great way to add notes to a chart or digitize a lab Rx. 

Digitally Capture and Store Everything You Write with Ink on Ordinary Paper.

　

The DigiMemo L20 is a stand-alone device with storage capability that digitally captures and stores everything you write or draw with ink on ordinary paper, without the use of computer and special paper. Then you can easily view, edit, organize and share your handwritten notes in Windows.
When connected to a PC, the DigiMemo L20 offers an on-line writing function which can instantly synchronize your writing on the paper with the digital page in its software in Windows. It also is a USB tablet device in Windows.

[2] 

　

1. Take NotesPlace any ordinary paper or notepad on the digital pad. Write on the paper with the digital inking pen.The digital pad digitally records anything you write in its built-in storage device or an optional SD card in real time.One page you write is stored as one digital page.

　

2. Connect to the PCConnect the digital pad to your PC by USB port.

　

3. Organize Your NotesWith its DigiMemo Manager software, you can easily view, edit and organize your digital pages in Windows.You also can use the on-line writing function which can instantly synchronize your writing on the paper with the digital page in its software.Save any digital pages you arbitrarily select as a book file (e-Book).

　

4. Send via e-MailShare your notes with others via e-Mail.

[1] http://www.digi-memo.com/
[2] http://www.compamerica.com/digimemo/index.htm#l20b

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The following comes from:

TITLE I—ELECTRONIC RECORDS AND
SIGNATURES IN COMMERCE

SEC. 101. GENERAL RULE OF VALIDITY.

(a) I
N GENERAL.—Notwithstanding any statute, regulation, or
other rule of law (other than this title and title II), with respect
to any transaction in or affecting interstate or foreign commerce—
(1) a signature, contract, or other record relating to such
transaction may not be denied legal effect, validity, or enforceability
solely because it is in electronic form; and
(2) a contract relating to such transaction may not be
denied legal effect, validity, or enforceability solely because
an electronic signature or electronic record was used in its
formation.
Of course this is a law written by lawyers so it can not be as simple as these two paragraphs in fact there are a total of 13 pages you can find here. [1]

[1] http://www.medictalk.com/legal/s761.pdf

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