If you google your questions you will find a lot of advice online. Briefly, if your bed is in its second year, after harvest you should renovate ( meaning to mow it short without cutting the crown then rototilling it into rows). This will boost yields in following years. As far as mulch a few inches of straw works great, just wait until dormancy (late November early December) to apply. Please do some research online there is alot of good info out there that will help you.
Jake

Disclaimer: I've just started growing strawberries as of a couple years ago, so am by no means an authority on experience. But if labor is no problem and production and neatness and preventing disease and nasty color of leaves are the main goals, replanting every year is the way to go, at least according to the experienced farmer I asked.

It is true that there is alot about alot on the net, and sure check out what is on various google searches (though gardenweb is part of the internet, no?) though I personally enjoy hearing personal experiences from people, etc.