Searching for the definitive list of Beatles Fan Clubs and
Beatles-specific Web sites. This must include all individual band
members fan clubs - (John, Paul, George & Ringo)- as well as collective
group fan clubs worldwide.

Hi fancorps-ga,

It seems that you are searching for a complete, sweeping list of
websites related to The Beatles. In any situation such as this, Google
Groups is an excellent source of reference:

http://directory.google.com/

In your case, navigating through the appropriate categories guides one
to the Beatles category (of course they have their own!):

http://directory.google.com/Top/Arts/Music/Bands_and_Artists/B/Beatles/

More specific information can be obtained by selecting one of the
following subcategories (numbers in parentheses indicate the sites
located in this category):

Anti-Beatles (4)
Articles and Interviews (44)
Chats and Forums (14)
Directories (28)
Discography (10)
Downloads (30)
Fan Clubs (5)
Fan Fiction (14)
Fan Pages (84)
Friends and Family (43)
Harrison, George (87)
Image Galleries (18)
Lennon, John (102)
Lyrics (11)
McCartney, Paul (114)
Movies (17)
Places and Tours (19)
Resources (11)
Reviews (10)
Shopping (42)
Starr, Ringo (36)
Tablature (10)
Tribute Bands (84)

From here we can obtain the subcategories you expressed interest in:

Fan clubs: 
http://directory.google.com/Top/Arts/Music/Bands_and_Artists/B/Beatles/Fan_Clubs/
http://directory.google.com/Top/Arts/Music/Bands_and_Artists/B/Beatles/Fan_Pages/

John Lennon:
http://directory.google.com/Top/Arts/Music/Bands_and_Artists/L/Lennon,_John/

Paul McCartney:
http://directory.google.com/Top/Arts/Music/Bands_and_Artists/M/McCartney,_Paul/

George Harrison:
http://directory.google.com/Top/Arts/Music/Bands_and_Artists/H/Harrison,_George/

Ringo Starr:
http://directory.google.com/Top/Arts/Music/Bands_and_Artists/S/Starr,_Ringo/
 
It is worth noting that the listing of sites in each category are
listed in order of decreasing Pagerank (the algorithm Google uses to
find the most relevant results for a web search). However, the Groups
feature is not a simple search - in fact, there are actually countless
volunteers who receive category submission requests from webmasters
and determine if they are appropriate for the given category. This
further screening procedure ensures that only relevant content reaches
the directory pages.

I hope this has made your Beatle search easier...if you have a problem
understanding any of the information above please feel free to post a
clarification and I will respond promptly.

Cheers!

answerguru-ga
Google Answers Reasearcher