Tried and liked:

Most of the stuff that I use and like I discovered in 2009 and before. In 2010 there were few things improved my commute and that I liked a lot:

The Ergon GC3 grips.

Tchibo padded briefs that allow you to ride comfy wearing regular pants.

Pearl iZUMi Zephrr Cycling Vest, superlight, breathable, perfect for chilly Fall mornings when something like a jacket of fleece top is too much, blocks cold air in the front without overheating overall.

Tried and didn't like:

Brooks B19N saddle, might as well cut a piece of 2x4 for a lot less money.