kthx, must've mistaken 0.0005 for 0.005 ^^;

btw i googled satoshi after you mentioned it (never heard of it before), but im not quite sure how to use it as a bitcoin term. is it something technical about the network or the processing of information or is it synonymous for 0.00000001 btc (which was the smallest amount possible if im not mistaken), ie could i say "my current balance is 500 000 satoshi"?

oh and while im on the topic, why 21 million?
why is that (going to be) the maximum amount of bitcoins?
is there a specific reason for that exact number or is it just because the creator made it that way? (a round number like 10 million or a hex-divisible like 16 777 216 seems more reasonable (from the viewpoint of a noob of course))

also, is it theoretically(!) possible that all remaining bitcoins could be mined by end of this year or is there some algorithm or something to prevent that from happening (mining is basically luck-based, correct?)?
also, is there a guarantee that all bitcoins will be available by 2040 (or whatever year they predicted) or is possible that there might still be a few "unmined" btc 200 years from now?