Documentation suggests to try http://www.google.com/reader/m for Google Reader Mobile, but that takes to a desktop version of the site. However, http://www.google.com/reader/i/ works fine using a N900.
Desktop like browsing experience is great but some mobile sites are well designed for mobile use cases. Currently none of the links at http://www.google.com/mobile/ let you use mobile versions of Google services with a N900.
Update: could not figure out similar approach for Google Docs or Gmail. Changing user agent to Android was necessary to get proper UI.
Update 2: http://www.google.com/calendar/gp?hl=en#~calendar:view=a,
http://mail.google.com/tasks/android?pli=1 seem to work for calendar and tasks respectively.