spell save mechanics?

[oakfloorboard]

its been a while since i have had access to a PnP rulebook, so i was wondering if anyone could remind me how this works.

is it 10 + spell level for the DC that you save against? (is your core stat mod included?)

does spell penetration effect this, or only for spell resistance?

thanks for any info

[Snike]

Think there is ability modifier to that also.

Also pretty niffty reference area here for PnP:
http://www.wizards.com/default.asp?x=d20/article/srd35

[Ekental]

DC = 10 + Spell Lvl + Stat Modifier + Feat Mods (Focuses) + Item Mod (Focus Items, non-self-stacking)