[Osiris]

I wrote a battery laptop monitor : http://batterybarpro.com . I get about 1k uniques a day and net about $1500/mn in sales of the Pro version.

[CyberDildonics]

How do you get the word out on a utility like this?

[Osiris]

I started with a free version that I posted on various freeware software sites and as many forums about laptops as I could find. I also watched referral URLs can tried to engage users. Eventually users started spreading the word themselves. I've tried AdWords a few times but the ROI hasn't been great.

[Jayd2014]

What stack did you use?

[Osiris]

It's written in C# with PInvoke code to call the underlying Win32 APIs for the battery status.