No, the DS won't connect to the PS3.
yes you can It's no diffident than a PC and A PS3 to the WiFi that many people use that with there WiFi connection. You could also have a Laptop, 2 PCs, and 2 PS3s
All PS3s play games released for PS3s.
All the games I know about allow only a single online player per PS3. The number of PS3s that can go online from the household depends more on the capability from your internet provider because the PS3 and the PlayStation network would have no problem connecting multiple PS3s from the same location. Resistance 2 can have online co-op play from the same PS3, Warhawk and LittleBigPlanet may also allow more than one player on the same PS3 see related links
yes
He has 2 PS3s
Wherever there is wifi
PS3 can only get an online connection with DSL or Cable WiFi or ethernet
No the PS3 requires a WiFi or ethernet connection
PS3 no question because ps3 has blue ray and xboxes are cheap things only 160 pounds that's shocking and some of u think ps3s are a rip off but your wrong cause ps3s are worth what you pay for!
no because ps3s have single buttons but 360s have big hollow buttons
PS3's online at Wal-Mart run from $250 to $350 depending on the game inside the box and the extra controllers. You can get cheaper PS3s on amazon.com.
Yes, The PS3 Has wifi,indeed.