Easy enough to compute on your own with an excel spreadsheet scraping URL data.
Formula:
((A-B)/B)
Where the larger value is put in 'A'.
Easy-peasy!
yes, but this is for the masses who just go to places like Bitcoincharts.com and want to see a daily summary. a move like yesterdays 60% or whatever resonates alot more with ppl than it was up 10 USD with no frame of reference.