I find there are two American sites that are worth reading often.
They are firstly Publishers Marketplace, which is affiliated with the Publishers Lunch Service which is excellent if something of a sting at $20.00 a month, but it makes for entertaining reading.

Second is Publishers Weekly, the website of the Trade magazine and it like Publishers Marketplace offers a job search or jobs board function. Keeping an eye on these will give you a good idea of the types of positions that are available and the skills publishers look for.

I would also recommend using Simply Hired to do a locality search on terms like Editor and Publishing (Or Publicity or sales depending on your preferred route into publishing). I love Simply Hired it is smooth and can be used to provide an RSS feed to your RSS reader of mail client. Excellent!