In the games i run (in regards to edition) we use something we call the "best of both worlds" edition. The means that between 3.0 and 3.5 we use whichever rule most benefits the player in question.
Identify- This spell, the caster is allowed to choose upon taking the spell whether they want to use the 3.5 version or the 3.0 version (3.0 = least effect of a number of magical items; 3.5 = all abilities of one single magical item). After choosing, this remains fixed for that character's life
Ring of Jump - In 3.0 this added +30 to your jump checks. in 3.5, it adds +5, or +10(i think) for a ring of jumping, greater. We use the 3.0 version since the 3.5 version seems like a cruel joke.
What do the rest of you do about 3.0 and 3.5?