potions [...] floo powder [...] the resurecting of evil guys [...]
Oh, I should probably mention that these things don't require a wand, but they do require other stuff.
Potions require magical ingredients.
Floo powder requires ....well... floo powder.
The resurecting of evil guys does not
seem to require a wand, however, I could be wrong here. From memory all that it seemed to require were three ingredients:
the flesh of the ally (willingly given),
the blood of the enemy (forcefully taken)
and the bone of the father (dug up out of the ground in a really creepy graveyard. Or failing that, a moderatly creepy one should do. Just avoid the nice ones.)
The other spells that I mentioned don't seem to requre anything at all though.
Oh, yeah, and other spells that can be cast without wands are the mental shattering of wine glasses (PoA) and the inflation of aunts (PoA).