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I would say Shaman and Beastlord. Both are able to solo quite efficiently, and both are of good use for groups due to their buffs. (Raiding may be a different thing, though...)
Once Shamans have their pets and their cannibilization ability, they rock at solo (learn to use your heal over time spells on yourself and you are set). Rooting and dotting (root/rot) is the shaman's favorite method of solo killing. Mages and Beastlords are also excellent soloists thanks to their incredible pets and their melee abilities. Druids and rangers kite (meaning they irritate a mob enough to keep them chasing them while they plink away at them with dots and arrows.. running for their lives all the while) with snares, dots and arrows.
As far as the question of raids, shamans are definitely sought after for slowing, healing and dps. (Shaman dots are second only in dps to the necromancer btw.) A successful raid will have a fairly balanced selection of all types of classes.
Honestly there are few classes that cannot solo now. The addition of the heal, haste, and mana regen potions combined with the damage shield, buff potions and other goodies available from merchants and shamans, it's possible to successfully solo with any class. The trick is simply to find where to do it most effectively for your race/class.
I don't recommend everyone piling into crescent reach to do newbie quests and such, not exclusively. Explore! Norrath is a beautiful world and even the old world zones hold surprises and fun for everyone willing to explore them. Walk through Hollowshade Moore in the evening and watch Norrath setting in the night sky. Wander around Nektulos Forest (watch out for the guards though, they are evil) and bash a few skeletons. Chase frogloks around the swamp of no hope. The newbie quests in Crescent Reach are a lot of fun to do and you will earn some interesting gear for the levels (some of the zones in TSS are simply gorgeous). There are just so many things to see in Norrath; take your time, enjoy the scenery and have fun.