I have had good luck using Notability for iOS:
https://itunes.apple.com/us/app/notability/id360593530?mt=8

Easy to import PDFs, easy to highlight, easy to annotate with handwriting or typing, and easy to export back to PDF. Fairly responsive on my old first generation iPad.

The only drawbacks I've found are:
1. Documents with handwriting or free form drawing get larger r than I would expect (~ 1 MB per page for a page of Calculus homework or doodles)
2. Doesn't support ssh or git for uploading/downloading documents

I looked forward to trying it out, but it required iOS 6. :-( My poor old iPad isn't supported by iOS 6.

This information has never been secret. Most electricity meters are mounted on the outside of the structure in an easily accessible location with dials that are easy to read at a distance with a pair of binoculars. This is by design, allowing the utility companies to do meter readings as efficiently as possible.

I have to second this, iSSH is surprisingly usable on the iPhone... it works well when you just need to jump in and attach to an already running gnu screen session to check on a job from a meeting or on the bus. Its not something that you'd write 10k lines of code in, but I would hate to be without it now. It even has a built-in X server.

My only wish is that it had skey/otp support built in, its a pain to have to keep switch to a different app to generate an skey response.