Hey Mang! is a free, open-source project that allows you to get your manga from your favourite sites.
And among its features are:
* RSS Downloads (Currently for MangaFox only)
* Update notification
* Path change
You just need to paste the first page of the chapter you want to download and that's it!
The program does everything exactly as described! I'm very satisfied with it, as it did ease a lot manga downloads. I have a single (little) remark: a progress window would be perfect.