I recently subscribed to Sky Angel IPTV (www.skyangel.com).  I started with one IPTV box, and I now have two.  I was getting continual buffering, to the point where the TV was unwatchable.  Here's how the problem was resolved:

1.  Sky Angel switched me to a server closer to my location.  That helped, but it didn't totally solve the problem.

2.  I have two IPTV boxes and four computers, all competing for bandwidth.  I have a Linksys four-port Cable/DSL router.  I wanted to make sure that the IPTV boxes always had priority on the bandwidth, and that they always had enough bandwidth.  I purchased a five-port Linksys switch, and connected all the computers to the switch.  I then plugged the switch into the router, and plugged in each IPTV box into the router.  This means that each IPTV box gets 1/3 of the bandwidth, and that all of the computers together share 1/3 of the bandwidth.  I then went into the QoS screen in my router, and I set the two IPTV ports to HIGH priority.

Since doing that, I haven't had hardly any problems with buffering, even when my bandwidth slows way down (I have cable internet).  However, when the bandwidth slows down, you do notice it on the computers (but not on the IPTV boxes).

Buffering problems returned.  Whenever I got a buffering problem, I would run speedtest on my IPTV box, and I discovered that my bandwidth was below 1 MB, i.e. not enough to run the IPTV box. 

I checked with AT&T (the DSL provider in my neighborhood), but the fastest speed they offer in my neighborhood is 1.5 MB, not enough for two IPTV boxes plus some computers.  So I increased my cable internet speed to the fastest speed.

This has pretty much solved my buffering problem.  On those occasions when I have buffering, I turn off one of my IPTV boxes.

To get IPTV on all of my TVs, I did the following:

• I have one IPTV box on the TV in the den.
• I have the other IPTV box in my bedroom, and I have an RF modulator connected to that box.  I then run coax cable to all of the other TVs in my house, including the one in the bedroom.
• I purchased an RF adapter (http://www.smarthome.com/8045i.html) for my Sky Angel remote control, which allows me to use the remote control from any room in my house.

IPTV is definitely the technology of the future, but it is a little bit ahead of its time right now, because of bandwidth issues.  There is no way that I could run more than one IPTV box in my house, because I am not guaranteed a sufficient minimum bandwidth in my house.