Demppa said:
there you should find some answers.
well, IAS means Increased Attack Speed, OIAS means IAS gotten from somewhere else than weapon. (I'm not sure about that) Mal is a rune. (such as eld rune or tir rune)
-Demppa
This is correct. OIAS is put in a separate category because some skills, such as a druid's fury or a barb's whirlwind, work differently when the IAS is on the weapon or another piece of gear (sometimes abreviated WIAS for weapon and OIAS for off-weapon.) Whirlwind, for instance, depends solely on weapon spead, so IAS from your gloves (OIAS) does not help at all.
Please make sure you understand IAS breakpoints, as hitting the next one can really make a difference in the effectiveness of your character. For technical reasons, if you have a breakpoint at 10 ias and another at 35 ias, you get the same result from having 10 ias as having 30 because you have not hit the next breakpoint.
You will not see a difference until you go over 35. Faster Cast Rate, btw, works the same way.
Hope I didn't drown you in information. You can always ask here, in the class specific forums, or in the statistics forum if you've got a specific question.