One thing I starting doing with another GTD app is to include simple prefixes before each task name. This helped me to quickly identify their association when browsing any type of list, whether by project or context. For example:

• // to indicate anything pertaining to my business (example: "// Call Jim to set up meeting")
  
• ++ for anything personal
  
• -- for client-specific work
  
• !! for tax-related stuff
  
• $$ for bills

Once you know your own system it's pretty handy.