Use of digital currency appears to be growing. At least, banks with online banking options are heavily marketing their services.

Did you know you can get an online savings account that pays nearly 6 percent interest? I read about it in a blog called Bank Deals. When saving for hobby purchases, every little bit can help. Of course, I'm not recommending any specific bank or account, nor does the Bank Deals blogger.

News reports about online banking say that use of online accounts grew rapidly in the 2000-2005 period. Growth slowed in 2006 — perhaps that's a simple enough explanation for why marketing efforts were stepped up. Now large banks and small are fishing for dollars online, and people are biting on the attractive rates.

Is online banking, and by extension digital currency, a threat to our bank note collecting hobby? In our lifetimes, I don't think so. It may even add fuel to the desire to collect. What do you think?