Hi,
I am thinking on three ideas.I am not able to proceed as my CSS skills are very bad so my output webpage looks ugly.
1) Stackoverflow is reactive. You have to wait for someone else to post a question before you can answer. As a developer, whenever I solve a difficult problem, I want to be able to tweet or write a blog about it so others can find it. However, unlike twitter, it will not be limited to 140 characters. This is mainly useful for proprietary softwares where senior developers/managers often need to train new comers. Essentially, this is yammer for developers.
2) When buying a home, commute time is a big factor but very few tools let you compare commute times over an extended period of time. For example, if I have 3-4 areas in my mind, I would like an app which sends traffic updates for these areas everyday at 8:00am and at 5:00pm. After a few ideas, I will have an idea of which place would be a better commute
3) A job search engine which is sorts jobs based on "Commute distance" from your home address rather than from city centre. This also takes public transport and spouse's commute also into consideration.
If you are interested, drop me a line at rgovind@cadence.com