Based on the latest Famitsu numbers...
PS3 comparisons: After 86 weeks, PS3 is where PS2 was at 19.5 weeks (July 12, 2000), where PSP was at 52.0 weeks (December 4, 2005), where GCN was at 92.3 weeks (June 16, 2003), and where Wii was at 21.7 weeks (April 27, 2007).
Wii comparisons: After 83 weeks, Wii is where GBA was at 85.7 weeks (November 7, 2002), where DS was at 67.9 weeks (March 18, 2006), where PS2 was at 95.9 weeks (December 28, 2001), and where PSP was at 146.9 weeks (September 29, 2007).
Based on the latest Media Create numbers...
DS vs PSP: Weekly shares of 45.7 / 54.3, bringing total shares to 70.0 / 30.0. If this week's rates continue, PSP catches up to DS in 1451.4 weeks (May 1, 2036). If DS stopped selling and PSP continued at this week's rate, it would catch up in 231.0 weeks (December 10, 2012).
Aaaactually, the lifetime split by Media Create numbers is now more like 69.98 / 30.02, so PSP has reached above 30% total marketshare for the first time since the week of 2006-05-08. As an even further historical note, the first time it reached as high as 30% was the week of 2005-01-24, during that post-launch few months when PSP outsold DS.
PS3 vs Wii: Weekly shares of 24.4 / 75.6, bringing total shares to 25.8 / 74.2. If Wii stopped selling and PS3 continued at this week's rate, it would catch up in 289.2 weeks (January 21, 2014).
Famitsu software pie for the week of 2008-06-23:
DS: 47.3
Wii: 22.3
PS2: 11.5
PSP: 10.4
PS3: 4.5
X360: 3.8
This is the first time PS2 has lead PSP in software percentage since two weeks before MHP2G. This is the closest X360 has been to PS3 since it beat it the week of this year's Idolmaster game.
A note on Famitsu/Media Create hardware discrepancies: the Wii number for the week of 06-23 sticks out, with Famitsu having 60K and Media Create having 48K. However, from a percentage standpoint the X360 difference is even greater: Famitsu has 3.2K while Media Create has 5.1K.