Which is why I use a Mac, w/OS X. Compared to everything else I've ever tried, it's the only one that I've never had to worry about battery life, literally hours and hours of coding. Also, with two small kids I need to close it and open it all the time, it's practically instant on, and I can pick right back up where I left off, and that's without ever plugging it in.

I also switched back to Safari from Chrome b/c I found Chrome to be a horrendous battery drain.

As much crap as Apple's gotten recently for their software, the attention to battery life is a huge blessing. My MBP is easily worth $ for the time and convenience.