Rockman.exe Online: Great site, provides pictures, summaries, fanstuff, and much much more. The only issue is that the information is generally based on the subtitled version, not the edited dub. That means that some of the names are different (ex. Megaman's name is Rockman) and that sort of stuff. Still a great source for all your NT needs.
covers all seasons of Megaman.
TV Tome: Megaman
(original series) summaries, episode titles, character guide
TV Tome: Megaman NT Warrior
summaries, episode titles, character guide