Author of that service here. Yes, if you trust bitaddress.org, you should be able to trust bitcoinpaperwallet.com as well (provided you use the same security sensibility, starting with downloading the ZIP instead of running off of the website.)
Bitcoinpaperwallet.com is a fork of bitaddress.org and can be verified to use the same javascript generator. It's just a different look & feel, and it's only suitable for creating paper wallets. (I stripped out the features for brain wallets, etc.)
Plus, there's a new holiday design to enjoy.
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fbitcoinpaperwallet.com%2Fholiday-design%2Fbitcoin-paper-wallet-gift.jpg&t=665&c=ZNGWVwykHS041A)