My experience is that people hang on to business cards and correspondence/marketing material for a LONG time - years or decades. My impression is that most people don't know how, aren't able to, or generally won't retain digital information that long - so I don't mind spending money on paper, if it means that person (or their kids) will call me in 3-5-10-20 years instead of looking for someone else.<p>Paper and physical things also convey a lot of information - not just their literal content, but also cultural/social and economic information. When someone spends a tenth of a cent spamming me with some crappy E-mail, I notice. And if someone spends $5 or $10 to send me nicely designed marketing material on nice paper, I notice. I'm not saying that dictates my buying decision - but I know that I'm willing to spend money on marketing if it's to the right person who's likely to do business with me, and if I can tell someone spent real money to reach me or communicate with me, it demonstrates that they're seriously interested in interacting with me.<p>Nice materials also suggest permanence/longevity and success - I'm pretty wary of spending a lot of money with an organization that appears to consist of one guy with a laptop and a cellphone and a $20/month VPS - because I don't feel very confident that he'll be there if I need post-purchase support, or I want to buy another one of whatever he's selling.<p>If I talked to someone who said "I don't have a business card but if you give me your e-mail address I'll get in touch" I would suspect that the person wasn't very committed to their business/profession if they couldn't be bothered (or couldn't afford) to spend a little money on business cards. It <i>would</i> make an impression - but not necessarily a favorable one.
I still do and I'm pretty sure they get trashed after, but that's acceptable, the purpose in my case is to reinforce brand presence and work seriousness, not exactly to share my info, the client already got my info from the site.