Indeed.com is a great site. A previous HR person recommended it to me. It's a "meta" site. It goes out and gathers the posts from other job hunting sites and company sites, so you don't have to go to them individually.
Glassdoor.com can provide some insight into a company. People can post info, salaries, interview experiences about companies. Just take the comments with a grain of salt as with all internet sites. However, since it's based on user input, some companies won't have a lot of info.
