Wise_Monk: programming is hard. Implementing the feature that you'd like to see (silent downloading) would take MANY, many hours of programming -- something that many people would not like to do in their spare time, much less NOT get paid for it.
Visual Basic is a far cry from C, C++ or even Java. These programming languages can accomplish what you want, but as stated before, would take time and possibly an entire team of programmers.
I recently started a degree program in computer science at a university here in Texas. I'm in my third year, and we're stillworking on stacks and queues and the like -- I doubt there'll be any network programming, or minimal, if any, which is what your project sounds like it requires.
Have you taken college-level programming courses? The programming is intensive and time-consuming, even for simple programs that just sort information. My suggestion: start with a smaller project. What you're trying to accomplish may be biting off more than you can chew -- you're simply asking people to write the code for you. If you knew the amount of effort programming in high level languages takes, you'd know why you're getting few responses.
I don't mean to rain on your parade, and I do wish you the best of luck finding people to HELP you program... that is, if you contribute your own sweat to the project, I'm sure many people would be willing to help. You could ask for help in writing, say, the Safari-integration side if you already had the guts of the program working. You could ask for help on getting the UI up to speed if the program is near completion, or vice-versa. It sounds like you want some talented programmers to do all the work for you, which is asking quite a lot of those programmers. If you don't want to do the programming and would like a team of programmers to do this for you, there has to be some incentive for the programmers other than the satisfaction that they made it work. If you're going to be the visionary and have the programmers do the work, offer them something. Give 'em some bait to bite on.
Good luck and I wish you the best!