My pragmatic side says stay with 32-bit, as all can benefit but my wanting-to-have-the-lastest-and-greatest-stuff side says it would be nice to see a 64 bit distro once and a while, so I've voted for: "Compromise by including some distros as 64 bit instead of 32 bit." However, there are some compelling arguments for staying with 32 bit distros. For straters, they will run on 32 and 64 bit PCs. They are also good for those who occasionally write into the mag to thank Mike for including distro "X" who are based in the back of beyond and run skipware without an internet connection to whom the cover discs provide their only easy means of upgrading their distros.
There have been comments about memory limitations with 32 bit distros. I'm not sure how compelling these are at the moment. For sure, 64 bit systems can address more than 4 GiB of RAM but, if my understanding is correct, 32 bit kernels that support PAE can exceed this 4 GiB limit by dividing memory into 4 GiB chunks. Also, for desktop users (the main focus of LXF), 4 GiB is plenty (famous last words) for everyday computing and I still don't see many of-the-shelf PCs that have more RAM fitted. Of course, power users will need more, so I don't deny there will be people here will have more RAM installed and of course the trend amongst PC vendors is for increasing the amount of RAM installed with the progression of time.
However, at some point 64 bit will take over, the question is when? Wasn't there a poll on here (I've searched but I can't find it) or in the mag recently that showed the proportion of 32 bit and 64 bit installations? As I recall, it was close to 50:50, no more than five or six percentage points away in favour of 32 bit. Perhaps we could decide on a point at which we should switch, either via an intermediate, mixed architecture stage or not.
Personally, my situation mirrors this (hopefully not imagined) poll. I have a seven-year-old desktop and a six-year-old laptop that are both 32 bit and two modern "nettops" that are both 64 bit, the nettops are 64 bit installations. Whilst I would not expect to get things entirely my own way with selection of distros on the disc (it's good to share) my favourite distro in both versions, if I get at least one version, it saves me a download when it comes to upgrading time, so I'm happy. That's my tuppen'orth.