DAP stinks, as does Internet Download Manger (sorry guys, i've used them before, and I really don't like them)
My favorite -
http://www.flashget.com
FLASHGET!!! Strongest download manager I've ever used. Most downloaders, when they split files, do not reuse connections when they finish a part. Flashget reuses the connection, so as each part finishes it splits the file even more so you always have the most connections to a site. (This is a good thing)
Only downsides of Flashget - It is a really great program, but for newbies it can seem a bit weird. It passes after a day, trust me.
Its not freeware, but you don't have to pay for it either. Just put up with an ad, or you can just put up with ONE dialog box when you start it up. Thats it.
