sharing a contact
Found a cool way to share contacts with other android or mobile users.
Pull up the contact you would like to share. Menu key > Share > Barcode Scanner (i assume you need the app barcode scanner installed).
This will create a qrcode of the contacts info that can then be easily scanned to a second device using the barcode scanner app. You could create a contact of yourself for quick sharing of your own business info.
Coming from a blackberry I know they just added this feature to BBM 5.0 and it was a very cool feature. People would create the qrcodes and save them out and use them in forum postings and what not.