I added some things after reading Grognardia and the post James made a couple of years back about his Dwimmermount Campaing House Rules.
I let the characters start with max Hps at first level but must re-roll all Hp dice upon gaining a new level. Con bonus are added as appropriate to the new total.
Two handed weapons. I allow a fighter or dwarf to re-roll the damage of a two handed weapon and take the new damage.(a slightly toned down version of the dwimmermount rule)
A fighter, Elf or Halfling with Dexterity 13+ may wield two weapons simultaneously, but makes only a single attack roll at +1 “to hit.” A successful attack deals the normal damage for the weapon, however.
I've also included the 'Shields will Splinter' rule and am trying to think of similar rule for deliberating breaking your weapon to do more damage. These are only useable by PCs.
Longbows can re-roll their damage dice once if they dont like their initial damage. New roll must then be taken. They cost 3 times a short bow and their advantage is a longer medium range and overall range. Long range bow battles arent something that come up much in my game.
I didnt want to muck about with the skill points so we are trying something a bit different. Our group split all the skills evenly between Int and Wis (except Languages which was too obvious and sneak attack). When a character makes a skill check they roll 1 dice plus a number of dice equal to their stat bonus for that skill. For most characters that still means they need to get a 1 on a d6 but they have more chance of doing so. If I, as the GM, decide a test is particularly hard I will subtract one dice or two for ridiculously difficult test. If this would drop a character to 0 dice I instead get them to make the test with a d8 for 0 or d10 for -1. I felt that Wis and Int were so underused as opposed to the other stats.
While this might make it much easier for specialists to succeed and their test I really dont have a big problem with that!
With any skill that a halfling only has one dot in she get +1 dice to represent Halflings luck!
I also want to incorporate a system whereby non specialist characters skill can increase as the make successful tests.
No one wanted to play a dwarf. Its a shame really that they are so crap game mechanics wise! (the bonus to damage Kobayashi mentioned above certinaly make them a bit more attractive. So would an active way of using those great saving throws but I havent though of one yet.)