Apparently the new Sony A55 and A33 DSLR's experience overheating problems if video capture is utilized too long. Below is a recent article from Popular Photography and Imaging.
Plenty of DSLRs put a limit on how long video clips can be. Canon's 7D and Rebel T2i cap out at 12-minutes and even the current king of video DSLRs, the 5D Mark II, maxes out at 29:59 or when the file size reaches 4 GB. But, Sony has recently stated that their new A55 and A33 cameras will overheat after a couple minutes of video capture when the in-body SteadyShot is turned on.