When deciding about a favor for your guests think about when and where they can use it. This goes for the shower or wedding. Here are some ideas to get you started.
I like the Heart shaped bottle stopper from Beau-Coup - definitely would use this.
or if the shower is a tea party, how about a tea tape measure. You never know when you might need one.
Food is always good - wrap up some cookies with a personalized sticker or how about some yummy jelly beans.
and my favorite - candles.
Yankee Candles has really cute personalized votive candles.