Bot Exchange
Common database of .bot files, where users can upload their own bots and download other builder's bots for their personal use. Also a synonym for "dream" in RA2speak. Not really a Troll-friendly technique, but when introduced in a discussion it can induce minor drama.
Past bot exchange
A long time ago on Gametechmods, there was actually a true bot exchange, but due to some unknown circumstances it went down. It apparently contained unique designs.
Present bot exchange
Yes, it's true, there IS a bot exchange on the official site... well, it seems that he went down too.
Future bot exchange
Goose and Serge promised a bot exchange to the community and apparently they both work on it independently. Goose promised it to be released the end of Summer 2008, but we have no clues about the exact release date.