I was in time trouble at the end, so I played that awful moves.

Move 22, your down a pawn, but you have potential for a kingside attack.  Generally speaking you never want to trade away your queen when your attacking or down material, so this is an easy point for you to learn.  Shredder confirms you would be ahead if you play rd2 instead.  Trading queens gives him the advantage, although he blew it later.  Anyway, as in most games between non-masters, a lot of big mistakes after that by both sides which you can see with computer analysis.  But at least you can take something specific away from it:  look for a way to avoid trading queens when down material but you might be able to attack or complicate. 

Move 31-35 is another place to look at with the computer to maybe learn something.  Shredder confirms your winning here.  You kind of lose a lot of time in here and dont really have a plan for stopping the pawns while still pursuing an advantage.  He missed checkmate in one after 34.  Ke4, but it was a bad move regardless because the king doesnt need to come up.  After he misses the mate in one, your still OK, but you really need a plan to defend by this point.