Link analyzer, useful?

I've been going around with this idea in my head for a while, but now I have some free time, so I'm wondering if I should do it. I'm thinking about making a link analyzer software which would have the following features:

Check for dead links: It would be able to check a site for dead links, both html and java, up to 5 levels deep.

Check if a site is linking to you: A common method to improve link popularity is not to link to any sites that doesn't link to you, so you can pass more pagerank to your own pages. It would be able to check if a certain site is linking to you, up to 5 levels deep, and also be able to run scheduled task, such as check if a certain site is linking to you, once a day.

Link popularity analyzer: It would check all, or a certain of the major search engines for links to any site, remove duplicates, and then return which sites link to it, and which anchor text they use. This could be used for both checking your own sites link popularity, and why another site might be ranking well for a certain keyword.

I've heard SEO elite can perform most of these task, but It's not free, this app would be 100% freeware.

So, would anyone find this useful? If not, I'm not gonna bother spending time on it, but if there is, I'll make it.

Check for dead links: See Xenu LinkSleuth which already does a very good job, without any "depth" restriction.

Check if a site is linking to you: Other sites may well object to you spidering their pages in this way, and using their bandwidth. I would certainly block such a bot. In any case "reciprocal linking" is out. Way out.

Link popularity analyzer: Such a tool breaks the Terms of Service of most of the search engines out there; avoid doing this.

Why do you have this unhealthy focus on links? What about the other 100 factors that are important to ranking?