FM 2010 Ad Boards Pack is an add-on created by Frank Hovis, containing adboards from 9 countries:

England - Blue Square North/South leagues and higher (and cups)
Scotland - 4th level and higher (and cups)
Spain - Liga BBVA, Liga Adelante (and cups)
Italy - Serie A, Serie B (and cups)
France - Ligue 1, Ligue 2 (and cups)
Portugal - Liga Sagres, Liga Vitalis (and cups)
Holland - Eredivisie, Jupiler League (and cups)
Belgium - Jupiler Pro, Exqi, 3rd Division (and cups)
Turkey - Süper Lig, Lig 1, Lig 2 (and cups)

Boards in Champions League and Europa League have also been updated.

Installation: unpack everything to: Documents/Sports Interactive/Football Manager 2010/graphics/backgrounds or any other subfolder (if "graphics" and "backgrounds" folders don't exist, first you have to create them).

Don't forget to disable skin cache and reload skin after installation!