Make rankings of:

-Top downloaded documents
-Top viewed categories
-Top viewed sections

Combine the list above with any of the possible filters:

-Current category documents
-Current section documents
-Specific category documents
-Specific section documents
-All category/document/autor (equivalent to no filter)

Additionally, optionaly filter by user options:

-Current vieweing user (actions done only by that user)
-Specific user (actions done only by that user)

And, of course, combine the two lists above selecting your desired timeframe, in the "relative time" mode:

-Last hour
-Last 6 hours
-Last 12 hours
-Last day
-Last 3 days
-Last 5 days
-Last week
-Last 2 weeks
-Last month
-Last 6 months
-Last year
-All time

Or in the "absolute time" mode:

-Today
-Yesterday
-This week
-Last week
-This month
-Last month
-This year
-Last year

Show evolution of:

-Dcoument downloads
-Category views
-Section views

Combine the list above with any of the possible filters:

-Current category/document being shown
-Current category to which current document belongs
-Current section to which current document belongs
-Specific document
-Specific category
-Specific section
-All category/document (equivalent to no filter)

Additionally, optionaly filter by user options:

-Current vieweing user (actions done only by that user)
-Specific user (actions done only by that user)

And, of course, combine the two lists above selecting your desired timeframe, to complete the chart's x-axis to show the items evolution:

-Last X days (define the number of days you want to consider)
-Last X months (define the number of months you want to consider)