They are a web hosting company offering a series of shared hosting plans. Their hosting plans are fairly priced and have a decent feature set.
You can host web applications written in PHP, Perl, Python or Ruby on Rails. They offer some of the usual geeky utilities like curl, imagemagick, phpMyAdmin, etc.
They are a green eco-friendly web hosting company, and to justify that claim they purchase Renewable Energy Credits. Their purchase of RECs covers the electricity to both power and cool the servers. They claim other hosting companies only cover the electricity to power the servers and obviously significant energy is spent in data center air conditioning to keep the servers cool.
It may be true other servers do not cover the power required to cool the servers. I'm not sure.
They do not name the source of their RECs making it hard to evaluate how credible their claims are.