The holidays are almost upon us and once again I go into my gift-buying mode to help you find that perfect holiday gift for the techno-person in your life.

A great place to start discovering some of the coolest technology gifts is from the folks at ThinkGeek. You wouldn't think that clothing would fall under the heading of technology, but ThinkGeek offers a line of T-shirts that truly cross the line.

Let's begin with Wi-Fi, the wireless technology that lets you connect your computer to the Internet or a local area network, including any connected peripherals such as printers and scanners.

To find out if there's a Wi-Fi signal where you're standing at the moment, you have to switch on your computer to see if a connection is possible or use some kind of Wi-Fi detector.

Having to unpack your notebook computer, switch it on and boot it up just to see if any Wi-Fi is available can be a pain. So many people carry along one of those little Wi-Fi detectors. These are typically small enough to fit in the palm of your hand.

These little detectors will at least display whether a Wi-Fi signal is present and usually offer an indication of its strength. More expensive versions can tell you the wireless network's name, channel and even if it's unlocked or secure.

But why carry around a Wi-Fi detector when you can wear one?

ThinkGeek has introduced its Wi-Fi Detector T-Shirt ($29.99).

The T-shirt itself is black. Emblazoned on the front is a graphic of a white triangular radio tower that looks like the one that appeared at the beginning of one of those old RKO movies.

When you walk into any place with a Wi-Fi signal, the little radio tower illuminates.

As the Wi-Fi signal increases in strength, c-shaped radio signal symbols to the left and right of the tower begin to illuminate in a soft blue color.

The stronger the signal, the more of those little blue radio signal symbols light up in an outward direction.

So all you have to do when wearing your Wi-Fi Detector T-Shirt is to look at your chest.

If you see a strong signal, it's time to break out your portable PC and make the connection.

ThinkGeek offers illuminated T-shirts that detect other things. For example, its T-Qualizer Shirt ($39.99) is also black and sports one of those graphic equalizer displays you see on nicer stereo systems.

If you walk into a room that's playing loud music or if you want to make a sound statement about yourself, this is just the thing.

The bars animate up and down in shades of green, yellow and red, depicting just how loud or quiet the surroundings are at any given moment.

Another T-shirt, the 8-Bit Dynamic Life Shirt ($24.99), depicts six hearts, horizontally next to each other. The idea is to buy one of these glowing shirts for yourself, and give one to your significant other. Initially only 2 1/2 of the hearts are illuminated. But as you begin to approach the other person wearing the shirt, more of the hearts begin to glow red, until all light up when you're within hugging distance of each other.

It's a cute and really different way to express your mutual affection. The shirt is available in styles for both men and women.

So there you have it.

ThinkGeek's line of illuminatedT-shirts are all machine washable. Just be sure to remove the animated decals and batteries that slip into a small pocket inside the shirts before washing.

You can check out all of these tech T-shirts at ThinkGeek's Web site, www.thinkgeek.com.