Strange "Access denied" and "Page not found" message in the Administer page...

Greetings. I just opened my administration section, and there are like 30 error messages in the log.

All the messages are from 4:06pm, time at which I wasn't online, and since my drupal site isn't operational still, this seems pretty weird to me.

These is a copy of part of my admin log... Notice they messages are all from anonymous users :\

warning page not found 2006-11-16 16:04 page/include.php not found. Anónimo
warning page not found 2006-11-16 16:04 phpkit/include.php not found. Anónimo
warning page not found 2006-11-16 16:04 html/include.php not found. Anónimo
warning page not found 2006-11-16 16:04 html/phpkit/include.php not found. Anónimo
warning page not found 2006-11-16 16:04 include.php not found. Anónimo
warning page not found 2006-11-16 16:04 db/~sqlitemanager/index.php not found. Anónimo
warning page not found 2006-11-16 16:04 db/sqlitemanager/index.php not found. Anónimo
warning page not found 2006-11-16 16:04 db/sqlite/index.php not found. Anónimo
warning page not found 2006-11-16 16:04 db/SQLiteManager-1.1.2/index.php not found. Anónimo
warning page not found 2006-11-16 16:04 db/SQLiteManager-1.1.3/index.php not found. Anónimo
warning page not found 2006-11-16 16:04 db/SQLiteManager-1.2.0/index.php not found. Anónimo
warning access denied 2006-11-16 16:04 admin/~sqlitemanager/index.php denied access. Anónimo view
warning access denied 2006-11-16 16:04 admin/sqllitemanager/index.php denied access. Anónimo view
warning access denied 2006-11-16 16:04 admin/sqlite/index.php denied access. Anónimo view
warning access denied 2006-11-16 16:04 admin/SQLiteManager-1.1.2/index.php denied ... Anónimo view
warning access denied 2006-11-16 16:04 admin/SQLiteManager-1.1.3/index.php denied ... Anónimo view
warning access denied 2006-11-16 16:04 admin/SQLiteManager-1.2.0/index.php denied ... Anónimo view

Anybody knows why this can be caused? Is it possible someone's trying to hack into my drupal site?