Research SaaS pricing, business model for electronic magazines

Hello and thanks for looking at this job.

IMPORTANT: Either you know what SaaS is and this should be straightforward research for you - in which case do bid - or you don't and there is no point going further.

I am looking into pricing for SaaS - software as a service - which is used for electronic magazines on iPad, iPhone and other mobile devices.

I would like to compare pricing between different SaaS products already out there. Here's an example of what I am looking for:
http://www.digitalartsonline.co.uk/news/interactive-design/adobe-rejigs-digital-publishing-suite-pricing-offers-lower-cost-entry/

So, the deliverable for this job is a spreadsheet/word document with a comparison of at least half a dozen SaaS pricing models, with some explanation about each.

Finally, the models should refer to known/used products, not never-used or theoretical products and/or models.

Thanks and happy bidding!