Since I posted the question, I guess I should give my response.
After I decide where I want to go--general area--I start my research.
First, I look to see if there is a hop on hop off bus. If so , I look at the route and stops. They usually go past all the main sights so this gives me an idea of what to see.
Next, I check my local library to see what recent guidebooks they have on that area and check them out.
I also go to my local mega chain bookstore with a coffee bar, grab a few recent guidebooks for the area, get a cup of coffee and go through the books taking notes. If I decide to buy a guidebook, it will be an electronic version for easy carrying--less weight.
Up next is the internet. Official sites for the area, cities, towns, attractions, etc.
Forums follow---here, TripAdvisor, Fodors, Thorn Tree, among others.
For hotels, I read reviews on Booking.com first since only people who have actually booked and stayed through the website can comment. Then Tripadvisor although I've learned they may not be real. When I find some hotel that look interesting I check rates and location. I like to be close to city center and/or transportation options. I don't really rely on guidebooks that much for this.
As for restaurants, I mostly wait until I get there for recommendations from locals.
I'm also a late planner. I leave in 2 1/2 weeks for an 11 week trip and only about half the trip is planned. It will all work out as I have been known to change destinations mid trip. I usually have my hotels set before I get there and have pre-bought any tickets that need to be purchased in advance. As for daily sightseeing, I decide that closer to my date of arrival. And in some cases, the night before.