In regard to Healing potions, I've extended their use. Basically, I've re-imagined them to be more like bottles of concentrated positive energy, rather than strictly a dose of medicine.
That small change has had some interesting, and often odd side-effects. Instead of solely drinking them, an application poured on fuctions as the spell. Of course, you still need a full dose for effect. Given that it's positive energy, a healing potion tossed at an undead causes damage as if the spell had been cast on the undead. This has led to some interesting battles, since my campaign is currently centered around PCs vs. vampires! Granted, it's not the most effecient method of fighting off undead, (and at around 300 gp per *attack* it gets pricey FAST) it IS effective! You still need those touch attacks (ranged in this case, but not much different than casting the spell directly).
On the flip side of this, the PCs are expecting to see some evil clerics tossing Inflict Wound bottles around soon. >: )
Last, the PCs haven't landed on the idea of ranged healing yet - accomplished by throwing healing potions AT rather than TO friends. I wonder how long it will take before they figure that out?