I mounted 2 shares, but I didn't follow the tutorial (I suppose it's this one: http://maemo.org/community/wiki/settingupnfs/ for os2008), I just got the modules from fanoush page and, since I didn't know that nfs-utils and portmap were available, I just used the "-o nolock" option (my shares are read-only anyway).
I'll try installing nfs-utils and portmap to see what happens.