Depends on what you call broadband. Most residential dsl connections are ADSL -- asymetrical. Downloads are a ton faster than uploads. Video conferancing is dependant on both. So you'd need SDSL or symetrical dsl so up/down are equal. Usually SDSL costs around twice as much as ADSL.
Cable is an option but when your hub gets congested, your bandwidth will be depleted.
If you can afford it, you can always get a T1 line installed
I've got 768/128 dsl and I've tried video. Not really an option for me due to hte low upload speed. I had 1.5/368 when Northpoint was still around and streaming video uploads went great -- usually because I got around 500k up rather than the advertised 368.
-Craig