They are fierce beasts, the query letter, the synopsis, and the sample chapter... some agents want just the query letter, some want a query and a synopsis (and you must determine whether they want a short or long synopsis) and some want all three. Some want one sample chapter and some want 50 pages. Each letter must be compelling and customized to the particular agent you are querying... oh the joys!
Though, I'll give it this, it is a nice break from raw editing... maybe I could write a new novel based on the dreadful land of Neverending Edit, in which you must battle the Sinister Synopsis and the Chilling Chapter, and travel on a Quest of Queries. Anybody up for an adventure?