what guild you expect for

If you're on a low pop server, or are willing to transfer, the guild recruitment (Alliance and Horde) forums is also a good place to find a guild in your range. If you're unwilling to do the work to read all the posts (and there are quite a lot), you can often post your own character and what you expect from a Guild Wars Gold guild (raiding times, nights, attendance requirements, loot system, raiding expectations for WotLK, etc.) and guild leaders/recruitment officers will often reply.

This should make collectors very happy: collect all you can now, and they won't take any space whatsoever once you learn them. Be sure to check out WarcraftPets for help on how to find them (that site's creator was recently honored with an in-game NPC). And everyone will gain at least two more inventory slots that are currently devoted to their ground and flying mounts (except people whose mounts are already summonable, i.e. paladins, warlocks, and druids). Excellent move, Blizz; this is even better than the vanity pet bags people have been asking for.

What we haven't known is precisely when the mounts will be usable (though Ulduar's Halls of Stone, a level 77-79 dungeon, was said to require flying mounts), and whether the "mount mittens" (or whatever they actually implement) will be a tremendous gold sink. Today Bornakk puts as all at ease, by saying that flying mounts are currently set to be usable in Northrend at level 77, you will use the same mounts currently used in Outland, and it is not expected that "a large sum of  WoW Power leveling" will be required (for another tier of mount skill or something). As always, this could change before the expansion goes live, but for now, it seems that we can look forward to not spending several thousand gold on griffin defrosting equipment.