Looks like everything's coming along nicely! The little purplish flowers that you can't remember are Lobelia. Also I could be mistaken, but your tiger lily looks an awful lot like an iris to me--any chance it was mislabeled? Here's a pic of a tiger lily: http://davesgarden.com/guides/pf/showimage/126095/ Unfortunately there are millions of different iris so I have no idea which yours is.
Your peace lily looks like it's getting sunburned--if they're outdoors I don't think they'd want to be somewhere that they get much sun so if you don't have a shady place for it I'd take it back inside.
For your first garden, you've managed to grow some really nice healthy and beautiful plants. I agree the yellow flower is an iris but such a gorgeous yellow! Now you can do what I would do--say you didn't get the plant you were really after so now you have an excuse to go out and buy another plant, LOL.