We've almost been married 4 months, on September 22nd, but I have still not changed my last name everywhere. To my defense it is such a project and there are certain steps that need to be taken.
Now I've gotten my SSN# update, drivers license, bank information, work emails etc. What I still need to update is my health insurance, payroll (asap), cellphone carrier and eventually passport. Although the passport won't be updated until I visit Sweden and get my green card application processed. Anyways, baby steps and hopefully before we celebrate our first anniversary I'll have it all updated.