Well you don't have far to look in terms of what area's are working for people, you only have to look in this Journal section and see threads from Monopoly & British Lion to see a Solid Niche website is the way to go. As for tools it depends entirely on what work your prepared to do yourself, myself I only use tools for research and site creation, as these are the area's myself I am interested in, but as for link building and SEO I tend to outsource most of the work, and the same applies for most the content. I am happy to brainstorm idea's though, I will be setting up a new Skype account shortly, and will look to add a few users on here. Until then feel free to pm me any sorts of questions or idea's you wish to discuss.
as for now im trying to download my copy of FSB, seams that they have some problem with the download cuz i do only get a page full with letters and numbers and if i take save target as i get one file named getscript so that is something wrong.. i have opend a suport ticket for it so hopfully i can get it tonight