OMZen - 4:16 am on Nov 22, 2010 (gmt 0)
Depends to a large extent on the page your link will appear on.
Have 1 site listed in BOTW and it shows up very low in my backlinks profile in the open site explorer count. I wouldn't bother with BOTW again, personally.
A better alternative would be to get a blogroll link from a trusted domain in your niche.