How did Sirius find Harry?

[cgbrennan2003]

No: HPFGUIDX 57458

I don't know if this has already been discussed, since I'm new (so 
please forgive me) but how did Sirius find Harry?  If, and it seems 
this is the general consensus, that Arabella Figg is Harry's secret 
keeper, no one should have been able to find him.  In PofA, p. 205, 
Fudge explains that the secret "...is henceforth impossible to find - 
unless, of course, the Secret-Keeper chooses to divulge it.  As long 
as the Secret-Keeper refused to speak, You-Know-Who could search the 
village where Lily and James were staying for years and never find 
them, not even if he had his nose pressed against their sitting room 
window!"

Okay, so maybe Figg isn't a secret keeper, but Voldemort alludes to 
some "ancient magic" keeping Harry safe while he's "in his relations 
care," so the secret-keeper idea makes sense.  Is it just applicable 
to someone who wants to harm Harry, like in SS with the mirror only 
giving the stone to one who wants to find, but not use the stone?
I'm assuming that, being James and Lily's best friend, he'd probably 
know about her sister, but still, how did he find Harry?  Did he just 
look him up in the yellow pages?

Okay, thinking about this wayyyy to much-I NEED that 5th book!!!!


"CG"