Not really a need to use such kind of software to "maintain" Mac OS X, but if you really want to, take a look at Onyx and keep away from CleanMyMac and MacKeeper, since they are known to damage your OS more than to clean it.
Performance Tips For Mac OS X
Five Mac maintenance myths
PS: I have run Onyx a couple of times after I switched from Windows to Mac OS X back in 2004 and 2005, as I was still in the habit of cleaning up Windows' mess. I soon found out, it is not needed.
Thank you for your quick and helpful reply. I will give those links a read. I just liked the many different tweaks to performance and look of the Windows OS that were possible using TuneUp Utilities.
Ordered my mbpr on the 2nd of October and I'm waiting while the order is "stuck" in processing items.... Feeling like a child waiting for Christmas morning. I'm 31, but I feel like stamping my feet and saying: "I want my overpriced gadget now!" .... Hehe