They are booming but certainly not "quietly"
- Bitcoin is all over the news
- Capital Access Network, Kabbage, etc are at multi 100M valuations
- Stripe and Braintree are running around at multi 100M vals.
- Simple and Green Dot / Loopt have done plenty in the PR circuit re their latest banking products.
- Kickstarter / Indiegogo are very much mainstream.
- Square is a PR machine at some 4-8B valuation (AFAIK)