There was a previous thread about UV mapping programs.
(Mainly UV mapper Pro and Ultimate Unwrap 3d)

I have both these programs and have used both extensively.

UV mapper pro is better for basic Poser stuff...its stretching and unwrapping of edges is great and so on...also if you are working from Poser you dont have to re scale the tiny Poser size model.(all other apps use a much larger obj scale...so Ultimate Unwrap requires this...re scaling the obj is no problem though, and you need to do this to see the model in realtime in the 3d window)

However overall Ultimate unwrap 3d is a much much more powerful program......you can subdivide any part of the model with out destroying the UVs (very usefull), you can pan the cAMERA around the 3d model in real time and point it at vertices and UV map them in real time in 2d (AWESOME FEATURE),
also you can grab a line of vertices and straighten them vertically or horizontally in one stroke (doing this on UV mapper Pro is a point by point PAIN IN THE REAR!!! and slow as hell!!
I would get both...they dont do the same job, rather they do different areas in a way.
So to sum up...for basic Poser work...UV MAPPER PRO
For just about everything else ULTIMATE UNWRAP
However to be honest Ultimate Unwrap is like a version 3 of UV Mapper pro...its quite a long way ahead.
Cheers
Harvey Mann