If you study previous- and some current threads you might notice some common tendencies which might affect your site negatively if faced by a Google update.
That means, there are steps you can follow and an action you take to prevent your site of receiving those infamous nasty hits by updates.
All of you kind fellow WebmasterWorld members are invited to contribute to this thread in the spirit of sharing and learning.
Allow me to start with my own contribution:
- remove duplicate pages.
- remove 100% frame pages.
- remove pre-sell affiliate program pages with content provided entirely by affiliate program vendors.
- reduce the outbound links pr page to be less than 100 .
- make a 301 redirect non-www to www or vice versa.
- Don't add too many files at the same time.