These numbers are mostly meaningless.
PSN numbers includes more than just PS3 numbers. (PSP/PC)
XBox live totals include Windows Live accounts.
Both probably include duplicate/inactive accounts.
The XBox live gold number quoted above are from January, so it includes everyone that got a 360 for Christmas and was still on their 1 month Free Gold trial.
I would assume that both the 360 and PS3 have similar "active accounts" to "console sales" ratios. That would put active 360 Live account about 20% higher than active PS3 PSN accounts, bases on console sales numbers. (with about half of the Live account being gold members)