Fun, yet professional, logo for green building startup

GreenKonnect

At GreenKonnect, we're building the online destination for anyone in the green building industry. We're helping architects, interior designers, engineers, contractors, etc. konnect with the information they need build greener buildings.

Our target audience is split between two different groups. The first group, architects and engineers, come to the website to learn about new products and projects. The second group, product vendors and service providers, are seeking to connect with the architects and engineers and generate sales leads.

We are looking for a logo that represents our website as well as our target audience.

Here is an image of the current design: http://skitch.com/tmilewski/nbfxt/gkm-logo

1. We want the logo to be fun but still professional
2. The typeface should be clear and stand out.
3. The logo must work well in both color and in grayscale.
4. The logo should follow the color scheme of the existing site.

Please do not use any stock images or clipart in the logo!

Deliverables:
The original source files. Preferably from Adobe Fireworks or Photoshop if possible.