Some useful chart music links;

Official UK Charts Company
http://www.theofficialcharts.com/index.php

Radio 1 Singles Chart
http://www.bbc.co.uk/radio1/chart/singles.shtml

Radio 1 Album Chart
http://www.bbc.co.uk/radio1/chart/albums.shtml

Radio 1 Downloads Chart
http://www.bbc.co.uk/radio1/chart/downloads.shtml

Radio 1 Compilations Chart (V.A. & Soundtracks)
http://www.bbc.co.uk/radio1/chart/compilations.shtml

New UK Single Releases
http://www.newuksinglereleases.co.uk/

Global Singles Chart
http://www.mediatraffic.de/tracks.htm

Global Albums Chart
http://www.mediatraffic.de/albums.htm

All-Time Chart
http://www.mediatraffic.de/alltime-album-chart.htm

If you know any other useful Chart sites please post them ^_^.