A vacation was one of my suggestions but Whitney got there first. It's a good way to clear oneself of a rut even if only for a short time. Also traveling alone is good since you don't feel locked into feeling how you should act around people you already know.

Other suggestions is to let go of certain hobbies etc. that don't hold the magic that they once did but you stick with them out of lack of a good reason to make the break. Nothing more exciting than a new hobby.

As for romance, keep going out and socializing but don't look for anything other than having fun. You'll begin to notice who takes an interest in you (sometimes in retrospect) and let things build up slowly. Its so hard to start up any relationship by looking for it or pushing some one towards it before a comfort level has been established. Low pressure, fun loving...