What are some good PSP games that are Infrastructure compatible?

I love connecting online and playing games on my PSP, but don’t have many friends who have the same games I do. What PSP games have good infrastructure online on them (not ad hoc)?
Thanks!
Syphon filter combat ops is probably the best multiplayer game out. Lots of people play it. You can customize maps and even what you’re wearing. The weapons are modern and gameplay is realistic
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December 20th, 2009 at 1:19 am
MGS Portable Ops +, and the Syphon Filter series
Tekken: Dark Resurrection
or
Field Commander
socom
Burnout!!
Killzone: Liberation
References :
http://answers.yahoo.com
December 20th, 2009 at 1:39 am
Medal of Honor Heroes 2
Dj Max Portable
Killzone:liberation
References :
December 20th, 2009 at 2:28 am
Fifa world cup 06
Nba live 06
Pursuit force
Bounty hounds
Syphon filter
Burnout legends
Metal gear solid portable ops
Lego star wars 2
Thrillville
Medal of honor heroes
Dark mirror
Socom 1
Socom 2
Ratchet and clank – size matters
Need for speed carbon – own the city
References :
December 20th, 2009 at 3:13 am
Syphon filter combat ops is probably the best multiplayer game out. Lots of people play it. You can customize maps and even what you’re wearing. The weapons are modern and gameplay is realistic
References :
December 20th, 2009 at 3:37 am
http://pspgamerweb.webs.com
References :