Based on the latest Famitsu hardware numbers...
PSP comparisons: After 198 weeks, PSP is where PS2 was at 148.2 weeks (December 30, 2002), where DS was at 89.2 weeks (August 14, 2006), and where GBA was at 126.4 weeks (August 19, 2003).
X360 comparisons: After 146 weeks, X360 is where GCN was at 14.6 weeks (December 20, 2001), where PS3 was at 16.7 weeks (March 1, 2007), and where Wii was at 3.7 weeks (December 22, 2006).
PS3 comparisons: After 98 weeks, PS3 is where PS2 was at 21.6 weeks (July 27, 2000), where PSP was at 53.4 weeks (December 13, 2005), where GCN was at 101.6 weeks (August 21, 2003), and where Wii was at 23.6 weeks (May 10, 2007).
Wii comparisons: After 95 weeks, Wii is where GBA was at 89.7 weeks (December 5, 2002), where DS was at 70.2 weeks (April 3, 2006), where PS2 was at 98.0 weeks (January 12, 2002), and where PSP was at 153.6 weeks (November 15, 2007).
Based on the latest Media Create hardware numbers...
DS vs PSP: Weekly shres of 69.3 / 30.7 bring total shares to 69.4 / 30.6. If DS stopped selling and PSP continued at this week's rate, it would catch up in 512.3 weeks (July 25, 2018).
X360 vs PS3: Weekly shares of 57.7 / 42.3 bring total shares to 23.1 / 76.9. At this week's rates, X360 catches up to PS3 in 539.7 weeks (February 1, 2019). If PS3 stopped selling and X360 continued at this week's rate, it would catch up in 144.2 weeks (July 5, 2011).
PS3 vs Wii: Weekly shares of 23.9 / 76.1 bring total shares to 25.5 / 74.5. If Wii stopped selling and PS3 continued at this week's rate, it would catch up in 541.7 weeks (February 15, 2019).
PSP vs Wii: Weekly shares of 49.4 / 50.6 bring total shares to 60.4 / 39.6. At this week's rates, Wii catches up to PSP in 5,565.3 weeks (May 29, 2115). If PSP stopped selling and Wii continued at this week's rate, it would catch up in 136.0 weeks (May 8, 2011).
Week over week, most things are slightly down. The exception is PS2, which gets a small bump from having the week's #1 software title.
Famitsu Software Stuff
After two weeks, the game Pokémon Platinum seems to be behaving most like is Pokémon FireRed/LeafGreen. That pair eventually went on to reach 2.9 million.
Trusty Bell PS3 starts out lower than its X360 predecessor.
Wii Play is having its lowest weeks ever. It didn't appear on last week's top 30, though from this week's data we can tell it was #31 and calculate what the missing week of sales was. Here are Wii Play's weekly sales from launch to present, capped at 20K so we can see the lower weeks better. At first one might be tempted to think the game is finally dying away, but given its abnormal quality of coming with a wiimote, I imagine it will pick up again when Wii hardware sales do. It's still on a slow overall downward trend, though.
Actually, adding on Wii Sports to that image, we can see a similar dip. It didn't jump out to me the same way since it remained well in the Top 30.