I would be remiss if I did not plug, endorse, advocate on behalf, express my enthusiasm for, etc. Pete Fernbaugh and his Caught at the Crossroads blog's recently-commenced and now-ongoing DuckTales' 25th-anniversary retrospective, the inaugural entry of which can be found here. To my understanding, Pete plans to write a post for every episode. The afore-linked first one is a thorough, on-the-mark A+ effort, and there's no reason to not expect the same of future entries.
Chris Barat, via his News and Views blog, will soon be launching his own DuckTales 25th-anniversary retrospective. I've long considered Chris the leading authority on the series(*), but this is based on writings that appeared in print in the late `80's and the early `90's and have never made it onto the Internet. Pete's and Chris' efforts will go a long way to "fix" the woeful under-representation of DuckTales coverage and presence on the Internet. For too long, a completely fictional list of original episode air dates was in circulation, and can still be found here and there.
(*) The older writings that I'm thinking of were collaborations with Joe Torcivia. In all reality, Joe is no less of an expert on the subject than Chris. But because I've always had the impression that Chris is, to whatever degree, fonder of the series than Joe is, and has been outspoken as an advocate of it, I think of Chris as THE DuckTales "guy".