Where to group when leveling
 

Popular spots:

0-5 Wherever you start
5-15 Crushbone
12-20 Oasis
10-25 Upper Guk
10-25 Unrest
20-30 Lake of Ill Omen
20-30 South Karana
25-40 Mistmoore
40-50 City of Mist
50-60 Karnor Castle
50-60 Sebillis
50-60 Velketor's

This is where the people be, in general

How quiet is Highkeep for goblins on blue these days? Worth a look if you're in the WC neighbourhood :) (24-35ish)

Generally speaking a decent list.