The Core Lists:Rituals has been updated to include Category and Market Price data for all 109 Rituals currently found in among the numerous published materials for 4th Edition Dungeons & Dragons. Hopefully this will help some DMs out there, or maybe an indy software developer like Asmor.com could do something useful with it.
An excel file, as well as an interactive online version of the list, is available on the Core Lists website.
How could you use this new data? Well, I for one - when using the 4E 'parcel system' for loot - like to switch out Ritual books or scrolls for the monetary priced items. Having the market price info lets me do this MUCH faster than before.
Until next time - game on!