<p>I had a discussion with some colleagues mentioning that there are not too many projects that we do which make use of WPF for creating UI for a windows application (we almost always use Windows Forms instead).</p>

<ul>
<li>Are your experiences the same - i.e. there is not too much adoption of this technology?</li>
<li>Why do you think that is? And will we have a time when we see much more of WPF?</li>
</ul>

Though WPF was introduced few years ago it was too raw to use it in the real world apps.  Major problem that stops WPF from wide adoption is a lack of RAD tools and out-of-box components.  Currently we have Blend, more or less working Cider, but usable versions of these tools came not so long ago. Another reason is a completely different architecture which  leads to longer development time as compared with WinForms due to prolonged learning\adoption period for developers.
I think we will see rising of WPF in the next few years.