They might be looking for an online beating, if they lack proper spelling skills.
Besides sports, they could be looking to bet against other people at various things, like my personal favourite, the online coin toss, but more likely a p2p type site.
Possibly laws regarding the legality of online betting
A handicapping site which offers picks on various games
Betting on political or other events
Horse/dog racing sites only
Reviews or scam warnings
Famous gamblers
Books about online betting/gambling systems
Pete Rose