I have been using a wired Davis system for 7 years. I tried wireless, but was not impressed.

It may be just my location that makes it difficult, but I had problems with batteries wearing out in the coldest part of the winter.

For me, wireless was only convenient for setup. I went back to a wired setup.

Here are some resources to check out:

Ambient Software - Virtual weather station. Makes web enabling fairly easy. http://www.ambientweather.com/virtualstation.html

Weather Underground - www.wunderground.com This is a free service that allows you to store your long-term weather logs online. Very cool for watching trends...