I've reached a point in revising the novel that is requiring a lot of research. Stuff that I could have done during the first draft, but didn't because I knew it would slow me significantly and I didn't want to lose my momentum. Some of it is integral, and some of it is just to make the background or minor interactions be accurate. The rank of a minor character in the military, for example, or the layout and ambiance of a location. This is a major cause of slowdowns in my revising. When I spend a large chunk of my writing time doing research, I don't progress very far in the manuscript.
I'm getting the opportunity to do some major, hands-on research very soon, though, and I'm uber excited. I'll blog more when I get the chance, but I'll just say that I've been looking forward to this for a while. It should be fun!
How about you? Do you enjoy your research, or does it seem like a necessary evil?