A few tweaks to firm things up with our play-style, reprinted here for wholeness only, since they are not truly native to the setting, having only been touched on in an issue of Dragon.
Half elves racial traits
by argentmantleAverage Height: 5' 5"–6' 2"
Average Weight: 130–190 lb.
Ability Scores: +2 Dexterity, +2 Charisma
Size: Medium
Speed: 6 squares
Vision: Low-light
Languages: Common, Elven, choice of one other
Skill Bonuses: +2 Diplomacy, +2 Insight
Dilettante: At 1st level, you choose an at-will power from a class different from yours. You can use that power as an encounter power.
Dual Heritage: You can take feats that have either elf or human as a prerequisite (as well as those specifically for half-elves), as long as you meet any other requirements.
Elven Blood: You gain a +2 racial bonus to saving throws against charm effects and immobilisation by Undead.
Any one know of additional information? Dragon 178 is the only source I know for them... and of course Red Steel and the First Quest stuff.