Antec USB-Powered Notebook Cooler This instant

I bought this for my Dell Inspiron 1521, but unfortunately, it didn't help very much, and may have even been hurting.
It made the bottom of my laptop slightly cooler (to the touch) at times, but under a medium to heavy load, things didn't seem to change (again, according to my touch). I eventually downloaded the program Core Temp, and after testing a few different setups, I found that the cooler was most effective when it wasn't plugged in. I believe the problem is that, as other reviewers have suggested, laptops with intakes on the bottom need cool air blown into them so that the internal components can be cooled. This fan tries to suck the heat away from the bottom of the laptop, which for some reason, seemed to cool the bottom slightly to touch sometimes (as I said) but heat up the insides of the computer.
According to Core Temp, my computer was coolest when on the stand with the power off. The lift from the pegs appears to give the intake on the bottom a little more airflow. This is why I'm giving it two stars (in addition to its portability, and snazzy looks). Second coolest was my computer sitting on the table, and least, as I said, was when the fan was on.
This cooler may very well have been designed for laptops with exhaust vents on the bottom (unlike my Inspiron, which has them on the left-hand side). This cooler might work for you if you have those.
I returned mine today, and picked up the Belkin. So far, it seems to be doing alright, but I may post with updates if it exceeds my expectations or it is also a failure. If it fails, then I guess I'll plop down the cash for the Zalman.

Sidenote: As of the writing of this post, I only have this review under my belt. I'm always suspicious of reviewers like that, so I wish there was a way for me to prove that I'm just a guy with a hot laptop. I used to have one review, for the a CD by the band Half Japanese, but I deleted it because I wrote it five years ago and, frankly, it was terrible (the review, not the CD).Get more detail about Antec USB-Powered Notebook Cooler.