I voted other, since I wasn't sure where these would fit.
- All characters get "pseudo-toughness" at 1st level. In addition to maximum hit points, they get +3 hit points as well as though they had the toughness feat. However, this does not count as actually having toughness for purposes of pre-requisites for other feats, etc. At low levels, these hit points help survival a lot, while at high levels, they aren't a big deal at all.
- When rolling hit points for new levels, roll 2 dice and keep the better roll of the two. This has helped avoid the case of severely crippled characters with low hit points. Low rolls still can happen, and the rogue managed to roll snake eyes, but over all, it helps keep the avg numbers slightly higher than average.
- If you roll a 1 on an attack roll, you roll again as if you were attempting to back up a critical hit. If you back up your roll with a hit, then nothing happens. If you fail to back it up, it becomes a critical miss which causes an attack of opportunity. With ranged weapons, instead of an AoO, it usually leads to a weapon-malfunction, possibly breaking the bowsting, etc.