Hmmm...I'm always so fixated on putting my GPS tracks on maps that I assumed that's what you meant. ;-)
It's seems like it should be simple to export workout summaries from Garmin Training Center -- but I just poked around and I couldn't figure it out.
Maybe some other software besides GTC would give you more options? I use
SportTracks sometimes. It's free and it seems to have a lot more features than GTC.