In Finland, mothers are celebrated on the second Sunday of May. In Mexico, the date is fixed on May 10th. Therefore, yesterday was the first in long time when I could celebrate at the same time with my mom and my in-laws.
Other than that, traditions are relatively similar. Family lunch and maybe some gifts or cards for the päivänsankari / homenajeada.
A slightly different (personal) view in Finnish is in my blog at http://www.jyri.org/blogi/2009/05/10/11 and probably explains a bit about why Mother’s Day is so controversial for me.