Re: Dragon
Good luck, those dragons have excellent fortitude saves, although I must admit that my sorcerer uses the same tactic when faced with such a beast (see my Rogue's Gallery for his character sheet). Last time we fought a huge red dragon and I was prepared with Stoneskin, resist elements (fire), shield, mirror image, mestil's acid sheath, extended haste, and greater magical flow enhancement.
First round I fired two polymorph others, my save DC's due to flow enhancement, feats, cha, etc. set at 27. Sure enough it failed the second save and we were faced with a small enraged frog. BTW, frog is definitely the way to go with polymorph other spells - turn the dragon into a dwarf and it still has spells and can attack and such. Turn it into a frog and you get a nice snack of frog legs
Needless to say our DM was a little upset that we dispatched his dragon so quickly (hey, it kinda bothered me too but it's better than dying), but I did waste a bunch of spells preparing for the fight.
We fought another red at an earlier level and I employed an entirely different set of tactics to bring it down - stoneskin, fire shield, haste and fly, then flew up real close to draw attacks of opportunity and started blasting away with snowball swarms. The dragon essentially caused its own death, my fire shield punishing it with cold damage from every attack while my stoneskin absorbed the brunt of the damage it inflicted upon me. Before I hit upon my plan we were losing the fight pretty badly. So S'mon, make sure you deck that dragon out with some sort of protection from cold attacks.