When I first started doing serious historical research 20 years ago, I'd have had to write a letter and wait for it to cross the pond, be opened, read and responded to, then posted back to me. All told, I'd guess that would take at least a month, if not more.
The internet may have its downsides, but for those of us researching the past of a country across the ocean, it's a huge boon.
What other research benefits are there out in cyberspace? Check out these sites:
Arts and Humanities at Intute - reviews of History resources on the web
BBC History - a comprehensive site with loads of information
HistoryWorld - world history site with timelines and more
Food Timeline - just what it says - with great articles
Center for History and New Media - a treasure trove for historians hosted by George Mason University
I could keep going and going *g*.
What's your favourite internet research resource?