I was surfing around Amazon last night for a couple Pi-related items and came across this by happenstance:
http://www.amazon.com/gp/product/B004OB ... 01_s00_i00
It's a small USB keyboard designed to work with a tablet or smartphone that allows for peripherals, as apparently many Android-based phones do. It was only $3.97 last night, so I bought one, on the off-chance that it might be made to work with my Pi. What do you think? Maybe other people might be interested in trying it, too, so I thought I'd share.