Branded affiliate programs are a great way to offer services to your clients which are not your core competency (for example you are web-design company but you would also like to offer hosting to your clients so that they have a one-stop-solution experience). This is what VoIPstreet Affiliate Program does for VoIP: you can resell a service to your customers which is fully branded with your logo. The service provides unlimited calls in the USA and all the features you would expect from a PBX (like caller-id, transfers, on-hold music, etc). Other information you might be interested in are the prices and the available phone models. One thing which I couldn’t find are the financial details of the affiliate relation.
Are there any good? From searching around the interwebs I found some old (2007) complaints, but it seems that it was a problem with their data-center and I couldn’t find newer complaints (which is a good sign). They also take part in industry events like IT Expo, whish means that they are definitely not a fly-by-night operation (one has to be careful, since the VoIP space has a lot of fraudsters who use cracked PBXs to offer cheap services).
Full disclosure: this is a paid review from ReviewMe. Under the terms of the understanding I was not obligated to skew my viewpoint in any way (ie. only post positive facts).