For most people (myself included), gambling at online casino's is a harmless pass time fun activity, but of course it can become a problem for many. IMO, to lessen the risk of becoming a problem gambler, there are certain things i bear in mind such as,
- Gambling for Fun - Not to Win Money

- Setting myself a gambling goal
- I Bet small (don't blow all your money at once)
- I practice gambling with friends

- Set time limits and walk away

Many of these are easier said than done of course but it might be worth noting. Online gambling is probably the best thing to happen since sliced bread

and i'm not saying these points could or would work for everyone but they might help in enjoying gambling in a healthy, financially sensible way.
I'm interested to know how you keep tabs and control on your gambling to make sure that one does not become a compulsive gambler or problem gambler. I set my own rules and limitations when gambling.
*I always remind my self not to be greedy and never be careless, especially when I am winning.
*I keep my self aware whenever I feel I am being greedy, when I notice signs that I am being greedy, I pass a bet and smoke for a while to cool down

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*Never to chase my losses, this sometimes leads me to even more losses.
*Know your limitations, and when to quit. I know that whenever I am lucky it doesn't last for a whole day. So, just a few sequence of losses, I quit and take away what I can.
I have a lot more, I hope this can help other gamblers in setting their own rule and to lessen greed when gambling.
Your advices might be very helpful particularly to newbies in gambling. For me, once you go into gambling it is very important to evaluate yourself first if you are ready to make some losses in gambling. Because if not, don't bother to gamble anymore. Gambling might be profitable as your kind of entertainment but once you expect an income from it, then it might only give you trouble in the end.