The Swiss Ramble blog provides the most in depth and careful analysis of football finances anywhere. His latest analysis is of current table toppers Ipswich Town: Tractors
Why should this interest Charlton fans? Well, there are lots of comparative charts and tables for all Championship clubs including Charlton. In most of them we are around mid-table, e.g., 9th in terms of net spend on players.
The current Ipswich approach is similar to that of Charlton in an earlier era, i.e., don't spend much on players, but try to develop them through good coaching. We also, of course, took some good players from Ipswich.