There is lot of literature on genre evolution/transformation and the internet in general, and I've found some linguistic and discourse/communication oriented literature on on-line book and movie reviews, but - up to now - very little work dedicated specifically to the more recent product or consumer reviews dedicated to all kinds of objects, from cell phones to travel destinations, and published e.g. on thematic websites and the connected forums (where users often post reviews or review fragments, in some cases mixed with other kinds of posts). Has anyone come across text linguistic or discourse analytical work about these genres?