Mount Everest Gets 3G Service
A lot of the audio compression done on cell signals can, and will, completely ruin a data connection. And even if the compression doesn't get you, the occasional dropped packet with silence fill enabled will cause the modem to give up entirely.
Gotuit Launches Broadband Video Portal
So, I realize that this is impossible, but I definately noticed almost no lag time (a second at most) both for initial playback and pause-restart. The longest lag point is when the page itself is being loaded. (DSL, highest transfer rate I've ever seen coming down it is 110KBps (Torrent).)