We got a clock for toddlers that you can set to show them when they can get out of bed and it has been great. The idea is that they aren't allowed to get up until the clock says its ok. We really found it helpful and moved them from a pre-6 waking to a 6:30-7 wake time.
Something like this:
http://www.amazon.com/My-Tot-Clock-Children-Better-So/dp/B001QS802K/ref=sr_1_2?ie=UTF8&qid=1336403861&sr=8-2
But also, I would move bedtime back an hour. 7:30 or 8 is really fine for a toddler.