Seeing the logo animation twice in a row at the start seemed a little excessive. Overall the interface is fun to use and easy to understand. Having a custom right-click menu related to the object would make it a little easier to do things to the stickers like reset the size or delete rather than dragging to the trash.
Your web site/ online app at http://www.pizap.com/ contains malware as of recently. I hope you can resolve the issue as soon as possible. I use the piZap editor several times a day on most days. I don't know of any other way to contact you, so hopefully you will see this message.
This is the reply I received from piZap ~ Sorry about that. We have a bug in the servers causing a few problems. We're on it though. Hopefully everything back to normal shortly. In the meantime, please use our Facebook app http://apps.facebook.com/piZap_editor/index.php
Thnx i have made a cool Timeline cover photo with the help of your site. The navigation is very effective and without Reg. is a goo initiative to attract more and more visitors for stay on your page. Its a cool stuff!