The downside of using digital collections of historical newspapers -- and being able to use them is mostly all upside, I hasten to add -- is figuring out where the hell they are, what they cover, and how to work 'em. My own use of Toronto newspapers collections is very intermittent, and every time I want to do some, I have to learn the system all over again.
Hence I was delighted to discover on the website of Jamie Bradburn, ace researcher/chronicler of Toronto history, a clear and detailed listing of historical Toronto newspapers that are or are not available online.
Thanks, Jamie. BTW, his blog on things Toronto is pretty good too.