MAC-KIWI  In the first, no one real virus or trojan on Mac OS X exists. All "existing" viruses or trojans are an "Proof of concept". A virus or trojan must installed without an user-interaction. The user is the bigger security problem. ;-)

In the twice, the AV can't protect your Mac in realtime. Came a virus, the AV-Developer bring the protection-code hours or days later. Realtime protection and absolute security are impossible.  
(Version 10.5.2)

ARROYODORADO  Sorry, but reorganizing your built in RAM is something so totally completely different from "cleaning the cache folders" that I doubt you understand anything this little app does at all - regardless of if it really works or not. I don't know if this app is an alternative to some reboots one has to do from time to time, but I think someone with such limited understanding of computers should not post discrediting comments like yours. My opinion.  
(Version 2.0)

NEUTRALZONE  Not only is cleaning the cache folders on disk not the same as the questionable purpose of this software, but cache cleaning normally lengthens startup time quite a bit! Startup time in OS X is optimized by caches, so when you lose those, they need to be rebuilt. When I dump caches, startup time goes from 35 seconds to 3 minutes.  
(Version 2.5)

JOHN SAWYER CJS  No no no! Speed Doubler and RAM Doubler were very useful utilities! I installed Speed Doubler on many Macs, and rarely had a conflict, and always saw a very noticeable speed increase. RAM Doubler was effective at its job of "doubling" RAM. I know both utils caused some problems for some people, but not the large majority, and when there were problems, it was often possible to prevent them by doing a few things (I forget exactly what, but not usually a big deal).  
(Version 2.0)

CRAIGSTANTONNZ  You were just a few days early. The new version (2.0) does work with Leopard and iPhoto '08  
(Version 2.0)