1. The website is
www.krusher.org
2.The exp seems pretty fast. The 50s seem kinda slow but nothing like live. Melee level faster than casters but all of them fairly easy to level.
3.I box 2 characters at a time but I have no idea of a limit on it.
4. Not too many raid encounters since most things can be soloed depending on how much time you wish to invest in killing something, Only things I can think of off hand that can't be soloed effectively or at all is Cazic Thule,the golems in Fear(Death Touch),the Sleeper, and maybe Klandicar. AoW,Trak,Vindi,and mobs such as this can be soloed