Those involved int he development mailing list are primarily working on the core protocol and client. There are myriad groups building various projects, some private and some public. The best ones are generally private, as the profit motive is involved.

The decentralized nature of Bitcoin means that it's a bit difficult for any person or group to get a full picture of everything going on. I pay quite a bit of attention, but only know a fraction of the people working on the big projects, and only still in English. I have no idea what's going on in other languages. Hundreds (thousands?) of entrepreneurs are building right now, they'll be getting rich with their creations, not with the speculation on current spot price of a Bitcoin.