Just a quick PSA on neti pots:
http://well.blogs.nytimes.com/2012/09/03/rare-infection-prompts-neti-pot-warning/

We have also started using higher MERV filters in the central AC/heat. Filtrete 2200s are available (I buy 6 packs from amazon) and I just found out while researching this post that 2400s are available so I may switch to those.