libcurl is pretty interesting. I have been using the standalone curl application for some time now, and it has been really useful. I have not coded using libcurl, but I think one can pretty much whip up a simple FTP client, or a web configuration utility tool in a jiffy (you should know what I mean).
Old versions of wget actually have a 2GB filesize limit! Discovered this when trying to download the Fedora Core 4 DVD ISO. It is really time to update! There is also a Windows version.