As this cropped up earlier I'll mention Trimble.
Today I updated Sketchup 8 free edition. I do not use auto update as it is something else calling on the PC resources. Anyway the point is this, the update request led me to the download selection page on the Trimble site. I was immediately impressed by the clean and clear layout of the page. I do not remember the update page on Google Sketchup but feel that in cannot have been any easier to use.
While I'm here. maxroe, I'm not sure about the point of your post, would you give more information please? If you are suggesting a 'conventional' desk then I think wherever the grain, of the wood, were running across a rail, or leg, then the thing would break. I am not a Sketchup master, not even a practised beginner, but I feel that carving a desk from a single block within Sketchup would be straight forward, except for drawers etc. I wouldn't want to build one like that though.
xy