Yesterday I saw James Marcus using 'more' on the command line and I asked him why he didn't use 'less'. He responded by asking me why people use 'less' and not 'more'.
I use 'less' out of habit because when I started using Unix 13 years ago it wasn't the same as 'more'—it was more.
But I guess somewhere along the line, the old 'more' disappeared and the new 'more' became the same as 'less'. So if you want 'less' now you can just use 'more'.
I figured it's probably a symbolic link, just like 'sh' is often a symlink to 'bash'.
I just checked on Mac OS X and, sure enough, 'less' is 'more'; but it's actually a hard link, not a symbolic link.
In contrast, 'sh' and 'bash' on Mac OS X are distinct files but with the same content.
Go figure.