For those that want to review the GREEN credits and carbon credit offsets, you can view the reports at this page:
http://www.hostgator.com/green-web-hosting.shtml
While I'm not a fan of making a big marketing ploy out of "going green" it does work, and it's actually something that WE have done in the past. Granted we never called it "going green" but we did run a campaign during the month of april in which each hosting account purcahsed equated to us purcahsing a tree. This was an INTERNAL thing that we did on our own as a company and not a public marketing thing.
We are however planning a public version in which we will dollar match donations, but we are still waiting on final information from the organization regarding tax deductions etc prior to finalizing it.
Can one be green? Sure, but it comes by the means of the carbon credits, which personally I don't beleive in. Plant a tree, sure, pay a corporation for the "carbon offset" - that's like donating to a charity organization and only 20% of your donation goes to the intended source, the other 80% going to management and resources etc.