Links collected here point to discussions and debates comparing the Nikon D80 vs Canon 30D.
This Canon 30D owner really likes the 0.94x D80 viewfinder compared to the 0.90x VFs of the Canon 20D / 30D.
From the Canon 20D to the Nikon D200, to Canon 30D and now back in the Nikon camp with the Nikon D80.
Related
Nikon D80 — Main page
Canon 30D — Main page