As far as modular and small office / home office furniture goes, you would be suprised at what some of the larger manufacturers are doing these days. Even more impressive is the extent that the smaller manufacturers have gone to in beating the larger corporations to the punch with their sustainable lines.
The RTA lines are not the best when it comes to thinking and buying green, however there are still alot of furniture options out there that arent addressing the green initiatives even to this extent. At this point in the whole “world thinking green” campaign there are very few manufacturers that are not publicizing their green lines. When looking for furniture, look for things like bamboo and other noticable features that are made from rapidly renewable resources.
Also, check out www.inhabitat.com. Their team sends out at least four or five RSS feeds each day that are extremely informative with sustainable advances is almost all areas of life.