Sorry, but I will play devil's advocate to Rodimus' post. IMHO LEED is a waste. I have been in the architecture/engineering industry for almost 20 years and I have been LEED accredited since 2005.
Being a LEED AP was helpful when sustainability was becoming a real buzz 5 years ago, but the overwhelming documentation required to certify projects turns off owners (they don't want to pay for it) and frankly is really no fun (it's 5% research, 25% technical writing, and 70% recordkeeping). Sucks for pretty much everybody.
Because of that suckage, and the fact that the USGBC is such a lucrative business proposition, there is a backlash rising in parts of the design/construction industry, usually aiming to focus on the holistic and altruistic facets of sustainability rather than "proving" sustainable practices as some sort of benchmarking and marketing ploy. In other words, recycle because you know it reduces landfill waste. Don't recycle as part of a checklist required to gain a certificate.
If measurement is really what you seek, there are outfits that are more flexible and maneuverable than USGBC/LEED. Like Green Globes, for example...
If your company will pay for it, you have time to kill, you need more letters after your name, and you really think it will help you advance in your career - I don't see the harm in going LEED. It is true that many municipalities are starting to require LEED certification for their new projects as well (though single- and multi-family residential will likely be the LAST thing to go "mandatory LEED") But as a necessary part of day-to-day operations and any kind of knowledge base, I think LEED's mostly a waste.
