For me it just wouldn't work... On-line sites can only accept credit cards/bank transfers, and I really like the money management inherent in gambling only with the cash I can afford to lose. My number one rule when leaving for a casino - Cash Only, NO CREDIT CARDS/ATM's allowed...
When I get the urge, I find that the free gaming at VirtualVegas.com suffices. You have to watch it though, there are pop-up ads to on-line Casinos, and it would be very easy to "accidentally" click one! If I was stupid enough to wager on-line, I would try one of their ads; frequently they offer $20-$50 free play (that should be warning enough)!
Keith