Try this for a source:
http://linuxgazette.net/issue70/chung.html
Adrian chung did a good review of techniques.
Else try a search with terms like: wget curl download file "multiple sources"
Don't think UR conclusion is totally correct. It is possible with curl to split a file numerically run one part using http:// in the background and another using ftp:// in the foreground. Yes there is a small delay from the server end but the big delay is at the receiving end where the parts may be fast getting to your ISP but between UR ISP and U it can slow to a crawl tho much faster than attempting to do a direct download of the file.
This is a technique used by those not on broadband.
Some improvement in downloading can be gained by examining:
http://www.ibiblio.org/pub/linux/doc...ing-HOWTO.html
Hope that helps.