The Base set is fantastic, easily one of the best designs that have ever used and is highly collectable.
The rest is crap imo.
Club Logo Holofoils (4 Per Box) a parallel set to the club logos from the base set (which look excellent in the base set) the problem with these is that they are exactly the same holofoil type as the champions series this year, i mean come on, if you are going to do 2 holofoil series in the same year dont use the same backing from the "cheap" series.
http://i290.photobucket.com/albums/ll261/stormernumber1/AFL/2008NRLCentenary_0003.jpg
Past Heroes (4 per box) Same holofoil stuff as above, this is an ok subset, but again they could of used a new backing for the Centenary series.
http://i290.photobucket.com/albums/ll261/stormernumber1/AFL/2008NRLCentenary_0002.jpg
Team of the Century (2-3 per box) all of the inserts look so similar, some great players in this 18 card set, but it looks too similar to all of the other inserts, nothing really separates this subset from the rest of the series making it an average insert.
http://i290.photobucket.com/albums/ll261/stormernumber1/AFL/2008NRLCentenary_0001.jpg
The foil sigs (1 per box) are not very high quality, very similar to the blue foil sigs from this years AFL Champions, the sigs are not smooth, they have what looks like a bad quality computer print. These are currently selling around $20 and I dont think they will improve on that price as they are not really limited, being numbered to 600 each.
http://i290.photobucket.com/albums/ll261/stormernumber1/AFL/2008NRLCentenary_0005.jpg
The Immortals (1 per box) look ok but nothing spectacular and they arent numbered, probably because they would be numbered to like 1400+ each, again these are selling for $20 on ebay and I believe that their value will actually decline due to the fact that there are only 7 different cards and more than 1400 of each card.
http://i290.photobucket.com/albums/ll261/stormernumber1/AFL/2008NRLCentenary_0006.jpg
Sketch Cards (1 per 2 boxes) nice looking cards, numbered to 750!! Again huge numbered, lowering the limited value of the sketches, they are selling for around $50 atm, and they will probably stay around the same value again not very limited and only 7 different cards making them flood the market like the immortal cards, only a little less common.
http://i290.photobucket.com/albums/ll261/stormernumber1/AFL/2008NRLCentenary_0004.jpg
Immortal Signature Redemptions (1 per case) Now I haven't gotten one of these yet but these will be the only limited card in the series so I expect these to be worth a fair bit in time to come, limited to 125ea which is nice, and there are 7 cards, the churchill foil sig will not be that valued but the other 6 immortals that have signed the cards will be worth a fortune in years to come.
So really I believe that Select screwed this release up by having 10,000 boxes, its far too many for a series like this, everything should be limited to make them worth collecting, as I think that within 6mths most of the prices will be dropping apart from the Sig Redemptions, also having the exact same 7 players in the top 4 subsets, Team of the Century, Immortals, Immortals Sketch, Immortals Signature Redemption, also takes a bit away from this release.
But of course this is just my 2c.