Download Manager

Before I start I would just like to say that I am totally new to programming so the things that I am going ask probally will sound basic and I might sound I bit ambitious in what I want to do.
The problem I have is that I have two network adapters connected to different internet connections now I want to use both connections when I download files from rapidshare. I have looked at the options of dual Wan routers and for the price I don't think they will provide what I need. The only way is for me to make a program which is binded to an IP address. So I want to create a download manager which is binded to an IP address. Now there are quite a few area to develop here. The first is the interface, then the actually downloading coding, binding codes and a few others. I would like to use an interface similar to the one provided by Free download manager, so i can be minimized to the tray, the download dialogue box can come up without the rest of the application coming on, to have groups and for it to remember the last download directory. Have a main display with all the files downloading, and must support multiple simultaneous download at least two, possibly a pause and stop function on there as well. The interface will take two IP address of the network adapters I want to use. Then the files that I download will be in a pattern so for example:
The first download will use internet connection 1, the second download will use internet connection 2, download 3 will use internet connection 1 and so on. This way I will be able to download as much data as if the two connections were actually merged together. it is sort of load balancing.
Is this really achievable or am I being to ambitious. It all will be done in visual basic 2008, so using .net. If yes I guess I will need a lot of resources so any good one for my level. Thirdly it would be great if I could get a feature where I could convert rapidshare links into direct links using my premium account. So any Ideas there.