DS vs PSP: Weekly shares of 53.3 / 46.7 bring total shares to 68.4 / 31.6. If DS stopped selling and PSP continued at this week's rate, it would catch up in 285.8 weeks (October 25, 2014).
X360 vs PS3: Weekly shares of 23.7 / 76.3 bring total shares to 24.6 / 75.4. If PS3 stopped selling and X360 continued at this week's rate, it would catch up in 287.5 weeks (November 6, 2014).
PS3 vs Wii: Weekly shares of 52.3 / 47.7 bring total shares to 28.2 / 71.8. This is the first time PS3 has outsold Wii ten weeks in a row. At this week's rates PS3 catches up to Wii in 2,367.1 weeks (September 14, 2054). If Wii stopped selling and PS3 continued at this week's rate, it would catch up in 204.9 weeks (April 7, 2013).
Week over week, everything is up, though moreso the handhelds than the home consoles.
Through the first eighteen 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: -36.3%
Portable hardware: -24.4%
Sum of all hardware: -29.2%