Hi and welcome. Lesson number one: use the Search button. All of these have been answered over and over and over. Anyhow...
1. Search on bbLight. I think it will do what you want.
2. It does e-mail. Very well. A few third party application (and growing every day). Check out Handango.Com. No MP3s. No Video. No beaming. No Bluetooth data transfers.
3. Search on Verichat or Rambler. There are a few IM programs out there now.