I'll have to be honest with you: I chickened out. I use VL for all stuff business related (mail, browsing, blogging, writing) and I use Dynebolic for everything multimedia related (podcasting, burning, ripping,...). Simply because Dynebolic is way more responsive when it comes to these tasks. K3b under VL is, apart from the issues above, is way too slow for my taste.
I do not mind switching between dedicated distro's. And in this case it is even more enjoyable as they both use Xfce by default.