Views - get nodes flagged or created by me
Views 3 supports groups of filters joined by OR. 


Edit your View.
Under "Filter criteria" click the little down arrow next to "Add" and select "And/or, rearrange".
Create a new filter group with the filter(s) you want.
Change "operator" to "OR".
Save.


If you're using Drupal 6:


  Views Or allows Views to
  combine filters or arguments with OR and fields with COALESCE.