Yeah Stalker0's Obsidian skill challenge rules are very well done.
I also use inherent bonuses.
When it comes to grid-free fights I probably should use a house rule, but so far me winging it has worked just fine.
As I mention in my Planescape thread, I'm going to try an action point variant.
At 1st level I give the PCs an expertise feat for free (since I consider it a feat tax). I also give out bonus non-combat feats & boons during the course of a campaign.
That's all that the players see upfront. Behind the scenes I do lots of monster tweaking. I could fill an entire thread about monster design/conversion/customization, but the big changes are:
all monsters use updated MM3 math,
1/2 HP for standard monsters,
Quickleaf's minions,
awesome-ified staged solos,
weapon type (slashing/piercing/bludgeoning)
unique (Damovan's Blade/blood of an innocent victim) resistances & vulnerabilities,
replacing traits & conditions contributing to grind (insubstantial, weakened, stunned),
removing multi-attacks (e.g. instead of secondary attacks for disease-inflicting attacks I up the base damage a bit and require the PC make a save when hit to resist disease)
I've found that my games work best when my "house rules" are really just baked in monster/encounter design.