You would need to encrypt the PK, otherwise its easy theft by picture...

Other than that I like it.

Depends on what you want to do with them. I designed this note because I wanted to store some of my BTC "offline", so I'm going to have it in a safe place I don't really care about encrypting the private key. The best thing to do though is place a hologram over it and the QR code for it.

Looks cool, but I would prefer all the text fields to have lighter background. Maybe make the QR codes level H, too. (and same sized)

The size of the QR code depends not only on the size of the data stored but also on the strength of the error protection.

Yeah, I think it's best to use the best error protection (level H).

Nice design. I like the background. Why not move one of the QR code to the back side that looks a tad empty now ?
Also I am a bit puzzled by the pi letter at the end of the word bitcoin (that reads bitcoip in greek). The nu letter is more appropriate it seems.

I agree with that pi letter. I think that all the text and data and qr codes etc should be on front side. Just like playing cards 

It looks awesome man, you just need to do something about QR codes.
Maybe use transparent QR code image?

I don't have photoshop installed now but will try to play with it little bit after installing.

Hey - aren't you going to put Satoshi's face on it? 

To me, the font for "Bitcoin address" is hideous. It looks like you wanted to go for something "classy" and it shows. It looks Russian or Greek, not particularly "global" or "cyber" or "digital".

That back of the note is a wasteland. How could you design a note and leave all that real estate barren? You could put anything there - anything inspirational you like - and it's left essentially blank.

Take some inspiration from there:
http://neatdesigns.net/worlds-25-most-beautifully-designed-banknotes/

Variations and detail subtly blended.

And even these copper round that are knocking around - they do a decent job of capturing the digital-ness of what Bitcoin is:


Look at all that detail! Use the whole canvas my friend

P.S. Don't forget the rule of thirds. And *blend* the QR codes and numbers into the design.