Drysc has posted that on May 21st, the official forums will undergo a few changes. While most of them are minor, one is a little more meaty.
To cut down traffic on the Guild Recruitment forum and give advertisements a little more staying power, the Guild Recruitment forum will be cast aside. In its place will be two forums, one specifically for Alliance advertisements and one for Horde advertisements.
That is definitely good news for aggressive recruiters, and I'm sure it will come into play even more in Wrath of the Lich King, when 10 and 25 man raiding starts up in that expansion's life cycle.