IIRC, PClinuxOS uses LILO, so Vla will it detect my current Ubuntu partition and dual boot it? Or will I need to fiddle around with bootloaders

?
I don't know where you got that from, it uses GRUB. When I installed, I installed it over my Ubuntu partition but it recognised XP with no problems. I can't see any reason why it wouldn't recognize Ubuntu.
BTW, since I already got you all trying out PCLOS, I can come clean about it now.

It was based on Mandriva, but with this release they really went their own way.
This is from a few months old interview with Texstar, the lead developer of PCLOS:
KnoLinuxGuy - The 2007 version looks great, how much has changed now from Mandriva
and what else can we look forward too in the coming year? How do you see this year for Linux
as a whole with Vista and new Apple OS X coming out?
Texstar - While the initial code base was Mandriva everything has been examined, updated, rebuilt and worked over. Its taken us 3 months but we are close to what we would consider a stable release. We do our own kernels, customized KDE and build things a bit different than the Mandriva way.
I see Linux continuing to grow on the desktop but I also see a big patent monster who is going to do everything they can to keep Linux down.
For a complete review, check
here or
here.