Ugh… who’d want one?
Solaris Laptop. Why?
If you want a commercial unix on your laptop, get OSX. If you don't care how commercial it is, get a BSD or Linux. If you need to do 'serious work' and your serious work is Solaris, then use ssh/remote X sessions.
Why would you want a pig ugly, expensive and probably way-too-heavy piece of hardware like this?
Tadpole Sparcle Solaris Laptop Review