MacRumors.com's Arnold Kim writes that a few of the participants in his website's forum are eagerly awaiting the arrival on March 29 of a new Nehalem-based Intel Xeon processor -- suitable for use in the fastest Mac Pro desktops.

What do these new chips bring to the table? Raw power: TechRadar found that 2.8GHz Nehalem Xeon processors scored a SPECfp benchmark of 160, compared to the current Penryn-based Xeon processors that scored just 90.

Kim makes a good point -- part of the reason we haven't seen much movement lately in the Mac Pro line is because of the popularity of Apple's notebook lines: something Apple admitted in its first-quarter conference call on January 21. What that means for the final release date of any new Mac Pro models is anyone's guess.

Once the processors are available for sale, anecdotal evidence would suggest it's just a matter of time before Apple includes them in new Mac Pro models. That's not a guarantee, though.

Last year, when Apple last updated the Mac Pro line, they offered a single highly-customizable build-to-order option, rather than a range of trim levels.

[Via IGM.]

Snow Leopard, the next major version of Mac OS X, will include minor tweaks to the user interface, according to MacRumors' Arnold Kim.

"The new theme will likely involve tweaks to the existing design and perhaps a 'flattening' of Aqua in-line with Apple's iTunes and iPhoto interface elements," Kim writes.

AppleInsider's Kate Marsal posted a screenshot of some controls purported to be part of the new interface, dubbed "Marble." It's unclear where the screenshot came from, as Kim writes that development builds have so far used Leopard's version of the Aqua theme. They could easily be Photoshopped screenshots of iPhoto or iTunes, so take that with a grain of salt.

Daring Fireball's John Gruber wrote that Marble was the codename for the new interface scheme in his Macworld predictions roundup, but said later he was wrong when it was not announced during the keynote. He wagered that the look would feature "iTunes-style scrollbars everywhere, darker window chrome, and a light-text-on-dark-background menu bar."

Snow Leopard is rumored to be released before the end of March.