I use curl and wget a lot, because I like downloading ISO images to test new GNU/Linux distributions, but I do not have a lot of bandwidth, so that usually means that I have to left my PC on downloading the file at night.
I also like to watch movies on Netflix in my Galaxy S3 or iPod Touch, so I have to limit the bandwitdh wget is going to use. Here is the command I usually use to download ISO images.
wget -cb --limit-rate=25K http://url.of.the.server/name.of.file
-c will continue any interrupted download from the place it was left. -b will start wget in background (the PID will be informed when it starts) –limit-rate will limit the speed or bandwidth available for wget.