I found this program, FreeRapid.
I’m currently running it in a virtual machine and also managed to pull the svn.
The programs looks really good and seems to work quite fine.
With FreeRapid you can give it all your DDL Site Links of a download you wanna get.
It can/will then check those links for availablility and start downloading automatically, Captcha-read inclusive.
I didn’t check if bypassing captchas is legal anyway or read DDL sites terms of service if they don’t disallow it or know if this is legal anyway, if I didn’t even read the TOS…
That’s something you’ll have to keep on your mind.
I also only tested it on one site so far, but it indeed does look helpful and interesting.