IKEA claims to have a recycling program at most stores for fluorescent lamps. They say to visit lamprecycle.org if you may need to find other resources in your area.
Another useful Web site is this one:
http://www.epa.gov/epaoswer/hazwaste/id/univwast/where/index.htmWhich lists many state and local recycling programs for fluorescent lamps/mercury-containing bulbs.