you can read it, from a linux perspective, [1] here - an a good answer to that [2] here.

in fact, there sees to be again some more attention on sun from the linux side, as there has been over the last years, as everyone thought that linux definitely won. but a lot of linux geeks are technical guys - and they have a look at that what is going on in other areas, and they had a look at opensolaris, the learned about zfs, zones, dtrace, rbac and so on. and that what they saw, did really impress them.

in consequence, some of them started to love these features and asked about anything comparable in the linux world. but to be honest, they could not find it (which is hard to me too, because i am working with linux since the early 90th). however, working for a company that tries to ‘consolidate’ everthing on the platforms linux and windows, that runs hundreds of linux servers from one of the major linux enterprise vendors, i am missing myself some real innovation in the linux world over the last years: no modern filesystem, virtualization only with the tremendous overhead of virtualized hardware, no real progress with systemtap and a security framework that is always disabled because it is unusable and not maintainable.

so in the interest of linux, it is more than worth to have a look at solaris and opensolaris, to have a impression about what linux should be a little bit more.