I know you can go to youtube.com and watch videos off the site from your phone, but is it possible to watch videos from other sites such as mlgpro.com etc. from your curve?????
YouTube, and a few other sites, re-encode the videos to a video format that is supported BB and streamed over RTSP. Unless those other sites do the same thing, no. Any flash videos will not work.
This to me, for the time being is the only 'real' downside to a BlackBerry. But, with the list of devices pending release and various OS', I'm sure RIM and Co. will see the light....