Theoforos originally pointed out this site back in 2006 on the Merry Christmas Everyone thread, but I think it got lost in the holiday cheer. ;-)
Anyway, I recently bumped into this site again, and thought it was worth posting in case you missed it the first time. It's a comprehensive collection of Laestadius' sermons in Finnish, English, Swedish, and Sami.
Welcome to Internet-adress www.laestadiustexter.se. On these pages You will find both original manuscripts, old copies and printed books, preliminary translations and other texts. It is allowed to freely use and share all this material.
It is allowable to copy any part of the books by means of the PC printer and photo copier for education and other kind of purposes. All kind of commercial use of the texts on these pages is prohibited.
You can download the files into your PC and read them by means of Your Web browser or Acrobat Reader.
Growing up in the ALC, I knew about Laestadius but never heard or read any of his sermons. I've since learned that Laestaduius' sermons play a much more central role in some of the other branches of Laestadianism, such as OALC, where they are frequently read from the pulpit.