We've already covered some of the reasons why BetFair is our favourite betting exchange, but there's another great reason for joining, and that's to get live streams. Not all events are covered, but provided you have some money in your account you should be able to watch your fair share of live sports from the account itself. Not quite SkySports quality, but it'll do.
Bet365, like BetFair above, also offer live streaming of football, racing and another of other sports. Once again, not every event will be covered, and there is a minimum account balance before it works, but there are plenty of matches to keep you entertained.
Whilst there aren't live streams on The Gambling Times, it does have a real time chat box where people will be discussing every match and event that's currently in play. A really useful tool for making decisions about inplay bets. Someone normally posts a working link to any match that's on as well, in case you can't find one for yourself, so just ask if you're in need.