LinkedIn Messaging Tools, Mailmerge?

Are there any tools for doing a mail-merge into LinkedIn? I have a list of folks I want to send a message to on LinkedIn (part prospecting, part networking), and I want to personalize every message. I also want to not open 150 tabs.

Preferably, I would really like to use a spreadsheet to control the name, small message, and wording.

Are there any standalone tools for this sort of thing?