I got a few messages from friends going "did you REALLY intend to send me this e-mail?" (And one minor complaint from a friend whose mail-reader couldn't parse the HTML-formatted text). Once they were satisfied it was legit, by and large they updated it. What was really cool was that a few others were also subscribers to the service or someone else had scanned their business card in with their scanners--so as a bonus, I got an image of their cards downloaded to my contact list. Groovy. eh?
Now I have all those hundreds of undealt-with business cards to scan...I'm looking forward to rubber-banding them with a little piece of paper that says "scanned!"