Sent to you by wicak via Google Reader:
Web site ConvertIcon quickly converts a PNG into an ICO (icon) file online, then lets you download the results.
This is a great tool to have bookmarked, especially if you’re at all interested in creating custom icons for you desktop. Personally, it came in very handy when I was converting my (admittedly crappy) Lifehacker Code images into icons, since finding a free, simple PNG-to-ICO converter for Windows turned out to be a pain in the ass. Adam Pash