well the site is
www.guildwars.com some info on there on the professions etc and game info.
I hadnt even heard of the game until a friend of mine said go to fileplanet and get a key/download the client to try this game.
From what i saw it was pretty good, a kind of vast fantasy world where you create a charcter that uses a combination of a primary and seconday class such as monk, warrior, elementalist etc. In terms of the beta my character was a warrior/Monk so i could have good melee abilities and using the monk as a seconday class i could using healing and ressurection spells. So there are plenty of clases to choose from each having their own skills and roles.
As dash said the graphics are pretty good, the world is huge plenty of choices you can craft by salvaging parts from weapons dropped by monsters and from them create stuff such as weapons etc. Or you can explore the world and take part in the quest based storyline where you carry out missions either on your own, with other people or yourself and some npcs.
When you gain a certain amount of exp you level up, which lets you focus in attributes that are key to your class, there are plenty of attributes to choose from that can focus in different areas. Also in cities you can buy spells that can be added to your arsenal.
You can even form your own guilds which other people can join and you can fight for battles in areas etc. The key to the game is its a vast fantasy/rp potential world where they focus on teamwork to complete quests etc.
In terms of the beta well every month they usually have a beta weekend in which the game is open to the public to particpate in. Though i have heard the rumours that the game will be out for purchase in the coming months. A lot of people say the game is diabloesque whether that is true i dont know but i'm a fan of rpg's and i have to say this is a pretty good one.
Another key thing is the game will be free to play, all you do is purchase a copy and then join the thousands playing online no monthly costs whatsoever. However they have mentioned there may be expansion packs say that will offer new things as they go along so thats probably why the game can be free to play online.