TITLE: How to select a journal?
QUESTION [43 upvotes]: What are good criteria for selecting a journal to submit a paper to?
One criterion per answer, please.
It is easy to group journals by subject and prestige, but is there a thought-process that you use to determine which journal is good for your specific paper?
For example, if you have a clearly top paper, it is not hard to find a journal that will accept it (the only question is which top journal to submit it to), but do you have favorite journals for specific types of projects, papers that are not earth-shattering, or other categories of papers?

REPLY [10 votes]: (This advice isn't my own idea, I am just passing along advice from senior mathematicians', I think I heard it from Bill Fulton.)
Before submitting to journal X, go to the library and look up journal X, and browse around. Would your article fit in there? (Do they publish articles in your field? Do they publish articles that are as technical as yours? Do they publish 95-page articles, such as yours? Etc.)