THE FSF has already expressed its opinion about Mono and Samba's Jeremy Allison did so too [1, 2, 3]. He wrote about the subject several days ago (he also put it in ZDNet, as usual, under the headline "Mono-mania: It's risky business").
The core problem is that Mono implements technology that is very likely patented by Microsoft. Microsoft, in its turn, has now started to aggressively enforce its software patents, as shown by its lawsuit against TomTom earlier this year.
Novell has been positioning itself as the Avis of Linux, a distant but gaining Red Hat competitor that "tries harder." Like Oracle, Novell argues that it can give customers Red Hat value at a lower price.
There's just one problem with this marketing spin: the "low-cost alternative" to Red Hat isn't Novell. It's CentOS. And CentOS is free as in $0.00.