Seriously.. this one can't be that hard to port. It's really disappointing busybox doesn't use less. I don't have the N900, unfortunately, so I would have no ability to test.

All someone needs to do is grab:
http://packages.debian.org/sid/armel/less/download

optify it, maybe change the control file a little bit and match dependency names with N900. Can someone verify that these are on the N900?

libc6 (>= 2.4), libgcc1 (>= 1:4.4.0), libncurses5 (>= 5.6+20071006-3), debianutils (>= 1.8)

I'm quite sure these were available to N810, although I'm not sure about versions. If the versions aren't right (N900 may have older libraries), then the less source just needs to be recompiled against the N900's packages.