Sun recently held a conference in SecondLife. Unfortunately there's no Solaris client - only Windows, Mac and Linux. Well, snv+49 has BrandZ, right? I downloaded Linux client logged to Linux zone and just started - it works very good and very fast! So all Solaris users - if you want to join Second Life go BrandZ :)
You can find Conference location here.
ps. Definitely forward over tcp to your X server in global zone rather than ssh x11 forwarding.