Kush -
Go Texans! Temp control is impossible in the summer and difficult in the winter down here. Here's what I've found so far.
1) +1 Swamp Cooler. Instead of my tub, I picked up a Rubbermaid storage bin, one of the 20 gal ones. Put your primary in it, cover with a wet t-shirt, and then put a few cubes of ice on the top in the morning and in the evening. That method got me down about 5F below ambient. You'll get a few more degrees cooling with a light fan breeze, maybe 8F below ambient.
2) +1 Yooper's Ice Cube. I just picked up an Igloo Ice Cube at Walmart for 22 bucks. I don't think they make the 60 qt version anymore since I couldn't find it on the Igloo website, so be careful if you buy online w/o seeing the product. Igloo also doesn't make the model without wheels (Yooper's doesn't have wheels, I recall) meaning that the bottom corner is beveled and may need need to elevate your primary a little. You can wet t-shirt in the cooler or, better yet, make a cool water bath like Yooper recommends.
The big advantage to this method is better heat transfer between your cooling medium and the Primary, more accurate idea of temperature inside the fermenter (due to improved heat transfer) and you don't need to worry about the t-shirt drying out.
You can even add a some bleach to kill the mold that will form. I've been thinking about super-gluing the drain cap closed so it cannot leak.
3) I saw an idea on BYO to take an old dorm fridge, open the door, and build a styrofoam box like a second fridge compartment. I haven't tried it yet, but will do it soon. I found 1/2 styrofoam at Lowe's for about 10 bucks a sheet. I'd plan on making everything double-ply for a better R-value. You can check out Dow's website for more info on Styrofoam. 1/2" gets you R-3 and 1" gets you R-5, I think.
Great stuff here:
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4) Pick a different yeast. I don't know much on this topic, but something I read on WLP001 mentioned that it stays somewhat neutral at higher temps, meaning less banana and less wretched (!) esters. I've also heard that you can let WLP550 just rip. I've actually got some going right now, in a Cherry Wheat, and it stopped working when the temp dropped to ~60-62F. My LHBS fellow said some folks have been so bold as to put a secondary with WLP550 on top of the clothes dryer to shake and heat things back up a little.
Hope this helps. If you find out anything more, make sure to post it.
OneShoeBrew