Initial impressions are good. Very clean, intuitive, and useful.

You could add more value in the cover letter and interview reminder section, and also add in a resume section. For example, in the interview section a person could create a list of stuff they need to look at or study, and then check them off as they're finished. Similarly, you could create and save different cover letter and resumes. A user could use special syntax like [[Edit company name]] to just edit the relevant parts and send the resumes off.

I can see this working with a very cheap subscription model ($1-2/month) if there are more features. I dont think have you have enough to sell it right now, since most job sites have their own job tracking system.