I second Daniel's post as to how there are not only no proprietary thermal sensor to be dealt with, as you can see in the OWC video, but there are none at all to contend with.
I just purchased the second of two 120GB OWC Mercury EXTREME Pro 6G SSD's, both with the new 32nm Toggle NAND flash. My plan is to RAID them, so as to achieve a 240GB speed monstrosity that will allow for data transfers of 900MB/s - 1GB/s. To do this, I will have to take the Mini apart almost completely, so as to swap the 2nd hard drive out for the 2nd SSD. I have the server edition of the Mac mini, so the 2nd proprietary SATA cable that is needed to install an SSD or hard drive is already there. I can't wait to find out if it will make a noticeable difference, as just one of these SATA III (6Gbps) SSD's are unbelievably fast. OS X installs in 4 minutes and change. Windows 7 in Boot Camp needs an extra minute or two and booting up is virtually instantaneous.
Lion Server (which includes several server components) downloads for me in about 30-35 minutes. The speed of the download will depend on two things: For one, if your own Internet connection is not a healthy broadband setup, it will take well over an hour. Secondly, you should plug your Mini into your modem via Ethernet, instead of using WiFi. Even the strongest signal of an advanced multi-channel 802.11n wireless connection can never be as fast as a wired one.
You also might want to make your own bootable Lion Installer on a USB flash drive and do the same for Windows 7, if you plan on using Boot Camp. I'd also recommend that you make your own USB Flash Recovery drive using the Recovery Assistant software that Apple recently posted on its website. This will help a lot, in case the (hidden) Recovery partition on whatever system drive you end up with gets corrupted or lost. That way, you won't have to rely on any Internet connection at all if you ever need to re-install Lion.
Sorry for the long post. I hope this will help the OP or someone else. I'll post the results of several benchmark tests on both OS X 10.7 as well as Windows 7 64-bitas soon as my dual OWC SSD 6G setup is complete. ;-)