UMPCportal has every mid/umpc thats available, and whats on the horizon.. and for my money the only pocketable one's worth purchasing right now are N8x0's and the Sony UX's, depending on what your needs are..
The Viliv does look good though, but noone really has one yet to give a definitive answer.

PS- Check the competitor section on this forum for some other MID's as well.. this thread probably shouldve went there.