Another Mac owner here. Actually, I'm versed in several operating systems as well as the binary language of moisture vaporators... ooops, I'm projecting again.

But seriously, I do have many different systems on my net: Mac OS X, XP, Windows 7, Linux, Maemo OS2008, and my fave, OpenVMS. (Yes, this is in my home... What can I say? total g33k...

)
I'm not particularly interested in the SecureSpot, and already have dabbled with OpenDNS (still haven't decided if I like it enough to keep it.)
I picked the DIR-655 because of the near-industrial strength features, like the syslogd, configurable NTP client, DShield support, and especially the Guest Zone. But I'm kinda flummoxed by the web filtering, hence my visit to these forums today.
Just don't forget about us Mac users! Oh, and at first blush, I'm tickled with the level of acceptance shown to Mac users on these forums -- stuff that would have started flame wars on other forums (e.g., "I own a Mac") are totally taken in stride here. Kudos...