Although Guild Wars 2 has mostly avoided catastrophic launch problems, the online game has been plagued by a number of small nuisances. Among them, that the "Trading Post," which is ArenaNet's term for its auction house, hasn't been available, and perhaps more problematically, that it's been difficult to keep a group of players together.
The first issue's now been addressed—the trading post is online. I haven't used it yet, but in an update from ArenaNet, they report that after resolving issues during a test, the trading post is now up and running. Guess it's time to finally get crafting.
Unfortunately, there are still a lot of problems when playing in a group, mainly in that it's difficult to keep a group as it moves around the world and are placed in "overflow" areas. From ArenaNet:
"We've made progress but still have capacity constraints causing issues with party and guild functionality, including symptoms such as party members not appearing on the map, parties not staying together as they travel between maps or into dungeons, and guild manipulation not working. We're working on a fix and will provide a further update tomorrow."
We'll keep an eye out for that update.
Game Status Updates [Guild Wars 2 Wiki]