Finally, Spotify is here in US. Pandora's endless recommendation works pretty well, but sometimes I would love to listen to one particular artist songs or one song repeatedly. It seems there's no way to export bookmarked songs on Pandora to anywhere, so made it.
Download Pandora-to-Spotify Google Chrome Extension
You need to use Google Chrome, may the latest version is required, simply download and install it with click the above link.
After that, let’s access your Pandora station page. The address looks like this: www.pandora.com/stations/1df87ce…random… You’ll find ‘Thumbed-up Tracks’ on that page. You may want to click ‘show all’ button. Then, hit the extension icon (I picked a brown bowl with chopsticks icon randomly). Probably most of tracks you thumbed-up will be extracted and converted to pastable Spotify formatted text. Finally, copy on the extension’s popup (Cmd-C if you use Mac) and paste (Cmd-V) on your playlist on Spotify. Of course, you need to run Spotify and create a playlist by yourself.
Unfortunately, there’s no bookmark page or something your bookmarked songs gathered, so need to access each station page respectively.
Hope it works and makes your music life even more fun.
Source code: https://github.com/zuzara/Pandora-To-Spotify
Update:
Right, it’s not easy to find a way to access the station pages. Here’s a hint. Hit ‘options’ then choose ‘Edit’. You’ll probably get a popup block alart. Allow to open a popup on pandora.com. You can also access the station page through ‘Your Profile’ link. Unluckily, you can’t hit the extension icon on the popup because it doesn’t have Chrome’s navigation bar at all… Please copy its URL and open with another tab.
Update 7/30:
Here we go! The extension is on Chrome Webstore now.
Thanks for contributing, Brian 
And, yes, Lifehacker gave me a link to this article.
Update 9/21:
Now it supports Pandora’s new UI. You’ll find your stations here.
Update 11/18:
Supports extracting tracks from Bookmarks/Likes page respectively.