Managing all your data

I download a large number of documents, pdf's, html's, and keep 
bookmarks for various sites.
Currently i maintain these in folders (except for the bookmarks). I 
find this arrangement very difficult to search through, and usually 
land up net-grepping all over again.

Do you folks have a better method, such as using a Content Management 
System. Will that solve my problem ? Can that search through PDF's and 
Word docs.
If you use a tool - which one ? I see tonnes of CMS's on the net: from 
Plone to Magnolia to OpenCMS ...

Or  should one install a search engine on ones disk  (htDig or Lucene) 
??

--
re
rahul