Can I record my stream and upload it so people can download my shows later ?

Centova Cast doesn't have any recording abilities,  however you could use an audio recorder (EG: audacity or SAM Broadcaster if you use this as your broadcasting software) and record your show (mp3 format), and upload to your FTP and provide a link to others to download & play it as a syndicated show (or "podcast") etc etc.

Some of the encoding software I use has the ability to record your stream as it's encoded. darkice and edCast are two of the programs I've used that I know off, offhand, that can record as they encode. Another option would be to use Streamripper.

Chris