Images/date/200505
Comparison of Japanese top sellers on DS and PSP. The legend is gone, but I believe it's gray (DS first party), pink (DS third party), black (PSP first party), blue (PSP third party).
Nearly identical; it appears I made one bar the wrong color and fixed it.
DS and PSP weekly sales, probably from the beginning of the year on.
Year to date chart for all systems.
A few sample images showing off an earlier version of the Dennis Miller Reference Generator.
Another DS vs PSP weekly sales chart, but with another line combining GBA with DS.
DS's (blue-ish) and PSP's (red-ish) weeks arranged from worst to best. Probably another way to show that while they had many similar weeks, DS's highs were higher.