[pzhon]

The main differences between cash game and SNG play are
[img]/images/graemlins/spade.gif[/img] Stack depth. Stacks are deeper in cash games except perhaps on the first level or two. This means there is more money left over on later streets, and speculative hands may get much better implied odds in cash games.
[img]/images/graemlins/spade.gif[/img] Survival value. 60% of the prize pool in a single table SNG is awarded when you make it into the money. This decreases the value of accumulating chips. It also means you can steal more from other people, since they don't want to be knocked out. Survival isn't nearly as important in other tournaments, but typical players greatly overvalue survival.
[img]/images/graemlins/spade.gif[/img] Number of players. It's important in a SNG to play well when there are 2-4 players. When you play cash games, you might only play with 5-6 players, or only with 8-10 players.
[img]/images/graemlins/spade.gif[/img] Antes. In late rounds of tournaments, antes greatly increase the dead money, rewarding players who are stealing blinds or otherwise getting involved in pots.

I think it is much simpler to learn to be a winning SNG player than a winning cash game player. If you are used to SNGs, you may want to start by buying in for 40 big blinds, which will simplify the game and make stack depth more similar to what you have seen in tournaments.