Here in the Extension office, our phone has been ringing off the hook about trees "raining" a sticky substance. If you don't have this problem in your own landscape, I'm sure that at least one person in your life has complained about it. All of the local nurseries also report that their phones are ringing off the hook about this topic.
The bad news is that this problem is extremely annoying, but the good news is that it will soon pass. My fabulous Integrated Pest Management colleague, Wizzie Brown, recently wrote a post about it, which you can find here: Urban IPM.
Also, I'll be addressing this question on an upcoming episode of Central Texas Gardener that is set to air on September 8th (at noon on KLRU), so be sure and watch.