Let's see.. here in Dallas,
LaCoste is definately in. Man, back in elementary I remember my brother wearing those "alligator" shirts that be bought for a few dollars. Now, they are $72 each! Trendy and "IN" sure does mark up the price on things.
http://www.toddski.net/archives/lacoste.jpg
(I wanted these for myself, too!

)
Uggs are fading out. The fad only lasted a year here. Or, what I know. I just never liked them. Especially in Texas where it's always hot and humid.
http://images2.nordstrom.com/images/...dium/39291.jpg
I know for a fact that
Converse All-Stars are a big trend. I don't think you can go wrong with them. I have a pair of red ones and black ones. They go with pretty much any t-shirt and a pair of jeans.
http://www.finishline.com/store/imag...xl7j231blk.jpg
And the other trendy things are the Boho flashy, glittery, beady sandals/flipflops but those aren't tennis shoes