I’ve just seen a pretty cool product for the iPad I don’t yet own (but lust after). It’s called Koder and is a US$5.99 app for iPad only. It’s a little bit like Notepad++ although a lot richer. I has syntax highlighting for a variety of languages – over 20 including PowerShell.
You can read a review of the product here: http://www.148apps.com/reviews/koder-review/, and can look at the manufacturer’s website here: http://www.koderapp.com/. The product is available in Apple’s normal way – via their App Store.
If I had an iPad, I would buy this application! Maybe after I finish paying for my new laptop!