Benny from Team Digital just told me some good news, all the Nik software is now soon to be 64-bit. That will be awesome with CS5 and my newly upgrade Mac Pro with 24gb of ram. Thanks for the heads up mate.
How To Update:
If you are a current Viveza 2 customer, you can get the 64-bit update from the websitehttps://www.niksoftware.com/site/ simply go the Support and then FAQS then you will see “Is Viveza 2 compatible with 64-Bit host applications”. Then follow the prompts from there
Next in Line:
The next products to be released are:
• Silver Efex Pro &
Color Efex Pro 3.0
• Dfine 2.0 &
Sharpener Pro 3.0
We are currently completing these updates and reviewing them to assure the highest level of quality.
I use Nik software all the time when working my images. It is worth getting Colour Efex and Silver Efex alone but the whole suite is nice. Don’t forget if your getting some awesome results with Nik software, enter the Landscape 500 Awards. Show us what you can do!

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Your Mac would kick some serious ass with a RAM upgrade like that.
oh yeah Matty!
Nik are bringing out HDR software …. should be interesting.
Thinking recently about upgrading to Mac and CS5. Came across this series of articles, which would seem to indicate that although you can install huge RAM and that CS5 is now 64bit there are serious performance issues with CS5 unless you take extra special care in setting up things like the tile size etc.
I have no experience at all with this but seeing that you just happen to mention CS5 and Mac Pro and memory in the same breath I thought I’d bring it up. Also an issue with mouse wheel scrolling and a number of freezing issues. Hope it helps.
http://macperformanceguide.com/OptimizingPhotoshopCS5-Intro.html
CS5′s priority is towards the PC platform, hence CS5 runs like crap on Mac 64bit.