First of all, I love WP. I've created a number of sites (using Artisteer) and my customers love it also. However, in this day and age of videos (including HD videos), I think the file size limit has to be increased. A demonstration video of approx. 4 minutes uses up the alloted 8MB, even in a standard format size.
I researched the forums and tried the various suggestions (change php.ini, etc.) to no avail. This seems like a relatively simple fix for WP. Thanks for putting WP where you have thus far.