cross class paragon paths

more interesting info from the wizards d&d forums:

divine oracle (cleric): roll attack vs will and initiative twice
radiant servant (cleric): radiant crits on 19 or 20
iron vanguard (fighter): con heal on kills and con damage to enemies you pushed and knocked prone
kensei (fighter): +1 to attack and +4 to damage with chosen weapon.
pit fighter (fighter): +1 ac and wis to damage
daggermaster (rogue): daggers crits on 18, 19, or 20 and dagger crit cause ca.
shadow assassin (rogue): enemy melee misses deal dex to them
knight commander (warlord): +2 attack to adjacent allies and + cha damage to ally's opportunity damage
sword marshal (warlord): swords!

orb wizard who goes cleric for divine oracle (yay, will attacks)
- infernal warlock who goes fighter for iron vanguard (yay, con synergy)
- twf ranger who goes fighter for pit fighter (ZOMG! damage)

one of my favorite builds is a tank warlock that goes bloodmage.
The warlock loads up on ac, temporary hitpoints, healing surges, etc. then goes into battle and uses the temporary hp to unleash massive extra damage. Your ac is between 3 and 4 higher than the mobs average rolls and you benefit from concealment 90% of the time, this allows you to run about cursing every mob with twofold curse, then every time you get a kill, you get 14+ thp, and can use them to power the 2d10 bonus damage to your wizard spells that you swapped for and the bloodmage powers.
blood pulse is also amazing with howl of doom or harrowfire.