If you've visited the website belonging to a glossy magazine, you've probably seen an online facsimile of the magazine - a little widget they use to allow you to "flip" pages of the real magazine...but online.
That kind of technology was quite expensive. But now there's a website, called Issuu, that is doing the same thing...for free.
It's a great way to put your newsletter online. What you need do is create a PDF of the document, upload it to Issuu and then embed it on your site.
Here's one I made earlier. Click on it to get a bigger version. (You can also embed the larger version direct on your site, with a little HTML coding.)