Based on the latest Famitsu hardware numbers...
PSP comparisons: After 231 weeks, PSP is where PS2 was at 184.9 weeks (September 13, 2003), where DS was at 100.9 weeks (November 4, 2006), and where GBA was at 156.7 weeks (March 19, 2004).
X360 comparisons: After 179 weeks, X360 is where GCN was at 16.8 weeks (January 5, 2002), where PS3 was at 37.5 weeks (July 25, 2007), and where Wii was at 5.4 weeks (January 3, 2007).
PS3 comparisons: After 131 weeks, PS3 is where PS2 was at 44.7 weeks (January 5, 2001), where PSP was at 67.4 weeks (March 22, 2006), where GCN was at 122.2 weeks (January 13, 2004), and where Wii was at 34.9 weeks (July 28, 2007).
Wii comparisons: After 128 weeks, Wii is where GBA was at 96.7 weeks (January 24, 2003), where DS was at 76.8 weeks (May 20, 2006), where PS2 was at 115.3 weeks (May 14, 2002), and where PSP was at 166.1 weeks (February 10, 2008).
DSi comparisons: After 28 weeks, DSi is where GBASP was at 45.5 weeks (December 25, 2003) and where DSL was at 15.4 weeks (June 14, 2006).
Based on the latest Media Create hardware numbers...
DS vs PSP: Weekly shares of 57.6 / 42.4 bring total shares to 68.3 / 31.7. If DS stopped selling and PSP continued at this week's rate, it would catch up in 495.0 weeks (November 12, 2018).
X360 vs PS3: Weekly shares of 21.8 / 78.2 bring total shares to 24.5 / 75.5. If PS3 stopped selling and X360 continued at this week's rate, it would catch up in 657.0 weeks (December 19, 2021).
PS3 vs Wii: Weekly shares of 43.4 / 56.6 bring total shares to 28.3 / 71.7. If Wii stopped selling and PS3 continued at this week's rate, it would catch up in 417.3 weeks (May 17, 2017).
Week over week, everything is down. Down around 40% seems the norm.
Through the first twenty weeks of the year, almost everything is down by some degree. Here's how the year-to-date year-over-year percents stand as of now.
Home hardware: -36.4%
Portable hardware: -24.8%
Sum of all hardware: -29.5%
It's worth noting that with the string of large weeks over, X360's YTD increase over last year seems to have peaked. This week it's +242.9%, compared to +246.2% last week.
This week is Wii's lowest hardware number since the week of 2009-04-13.
This week is DSL's lowest hardware number since the week of 2008-11-10.
This week is DSi's lowest hardware number since the week of 2009-03-09.
This week is PS2's lowest hardware number since... well, it appears to be a new low among Media Create records, though in the Famitsu numbers that go further back it was lower during intense shortages the week of 2000-11-27.
This week is PS3's lowest hardware number since the week of 2008-10-20.
This week is PSP's lowest hardware number since the week of 2008-10-06.
This week is X360's lowest hardware number since the week of 2008-09-01.
So I missed this when it was true news a few weeks ago. I think with Wii's continued low sales it came earlier than I expected.
As of the week starting 2009-04-20, Media Create has PSP hardware ahead of Wii since the week of Wii's launch.
Famitsu Software Stuff
Monster Hunter G Wii (3504) continues doing a little better each week than its 2005 PS2 counterpart (2077) did.
Taiko no Tatsujin Wii has always done well, but (thanks to Golden Week and/or the slight increase in Wii hardware sales?) after five weeks of increase it's just had its biggest week since January.
After 3 weeks of sales Disaster Report 3 (3506) is in much the same place after the first. That is, doing slightly better than the second (2419), but not as well as the first (935).
Deca Sporta 2 isn't exactly doing as well as the original... but it also seems to refuse to have much drop from week to week.
Still, after these four weeks of steady sales, it's only to about half of the first game's first week.