Yeah, there were several floating around at that time, as I recall. For example, Bitpay started up around that time, and they had a QR-code-enabled mobile app when they launched.

The first commit of bitcoin-wallet (most popular Android wallet presently) was March 8, 2011: https://github.com/schildbach/bitcoin-wallet

Here's another from that time: https://github.com/barmstrong/bitcoin-android

Thanks. I do remember using that one or one similar in maybe Fall of that year. I believe the first ones actually downloaded the entire Blockchain which was maybe a gig or two at the time. The one I had became unwieldy enough that I eventually just uninstalled it.