*in response to the original thread title alone... an old but still relevant article :)
http://www.joelonsoftware.com/articles/fog0000000069.html

*Great article, I also read the next two articles of the author about UI's, I makes me understand why poser users don't like D|S and vice versa, they just don't work the way they expect it to do.
I often use autocad and Rhino3D simultaneously and I get the same problems: they have similar functions, but they behave different: You mentally have to set a switch to use the other program.
And I think that's the problem with all 3D programs: when I try to learn  to use a new program and I want to use a function I know, beacuse I have used it in another program, it always doesn't work the way I expect it to do.
There should be some kind of standard for this, Modo401 has a great option to use different interfaces like 3Dstudio, Maya and others. If poser at least wants to attract some D|S users, they should have a D|S Interface option.

best regards,

Bopper.

-How can you improve things when you don't make mistakes?