Well they are not forced upon you - unlike Ubuntu buttons. And there are so much online crap it is easy to recognize need, crap can also be found among sources like common advertising schemes. Schools, work place can have other reasons to block stuff - like having incredible bad experiences with no blocking! But they need to think of site admins as well, give them info and chance to correct mistakes. I don't think K9 notify of block but their setup for this is not bad. They seem to act fast and correctly to complaints.

Why they are reluctant to get too chatty with admins probably has to do with the fact much is automated, they rely on scanners not human evaluation. I doubt anyone at K9 have a clue about Launchbar Commander. If all site admins were directly invited to complain they would need to work more, know why and why not they block this or that. Many rogue admins will try to trick them, like removing files/links/whatever - then put it back on after being white listed. Instead of going "impossible, they are excused" I would say any idiot could find out this was a FP so service fails! They must deal with that and figure out ways to dismiss obvious offenders as not to waste resources on them. Probably not that easy but have they even tried?

Also don't forget that once you enter security scene you run in to genuinely paranoid people. Those who actually get paid are probably even worse than the amateurs you see on for example WOTs forum. Will probably go "Yeah right dummy, welcome to 2011" to suggestion of being friendly to site admins. They are not easy to communicate with ;)

No I don't know but that does not stop me from posting :D Both of those you mentioned, and CleanMem, seems to be more about memory management than disk caching. O&O also have a buffer/cache for file operations though. But to free up memory which Windows holds back from being used is the message. As you can see from picture at O&O site less caching is considered a good thing because then there is more available ram for your programs. I wonder how CleverCache can handle SuperFetch other than simply turning it off?  

O&O Mem-O-Safe seems to be related to FancyCache which is free (for now at least) http://www.romexsoftware.com/en-us/fancy-cache/index.html  Read about it on their forum before installing. If you use partition version, activate it for C: and give it a long wait (Defer write/latency) to really use buffer effectively what happens if Windows go BSOD? Do you feel lucky or not? Effect is similar to a normal Ramdisk but potentially worse since FancyCache buffer/hold all types of data, you cannot tell it what to include/exclude. Definitely read about it first but it does work. I have used it for a while but not yet 100% comfortable with the idea. Pretty sure I will return, keep eye on it for now. Judging from their forum most people have positive experiences, especially those with SSD seem to be going crazy. Long thread on this SSD forum http://ssdtechnologyforum.com/threads/1107-Fancy-Cache-A-disk-cache-that-WORKS-for-our-SSDs!!!!!!-In-beta-now...?highlight=fancycache Might do wonders on old system with enough ram.

Seems like OCZ approves and is involved to some degree http://www.ocztechnologyforum.com/forum/showthread.php?79525-Interesting-new-hybrid-disk-cache&p=598218&viewfull=1#post598218

I have not tried this but if you have no ram to spare FancyCache can use external disk for caching. Like using an SSD to cache old slow hds http://www.romexsoftware.com/bbs2/en-us/viewtopic.php?f=25&t=694 Should also work with a flashdrive, a bit like Readyboost I guess http://www.romexsoftware.com/bbs2/en-us/viewtopic.php?f=25&t=634&p=1385&hilit=flash#p1385