recently only the EU-versions of Dissidia FF and Soul Calibur - the US versions don´t need to be patched
edit:
Here is a list of all the games that 5.55 firmware update on disc (as at 2009-09-11)
(I might of missed a few as I have not checked ALL the newer games)
1914 - Cloudy With a Chance of Meatballs (USA)
1913 - Dirt 2 (EUR)
1912 - Warriors Orochi 2 (EUR)
1911 - MotorStorm Arctic Edge (EUR)
1910 - Rugby League Challenge (EUR)
1909 - AFL Challenge (EUR)
1908 - Soul Calibur Broken Destiny (USA) mit patch läufts
1907 - Disgaea 2 - Dark Hero Days (USA)
1906 - Dissidia Final Fantasy (EUR) mit patch läufts
1905 - IL 2 Sturmovik Birds of Prey (EUR)
1904 - Heart no Kuni no Alice (Disc 2) (JPN)
1903 - Heart no Kuni no Alice (Disc 1) (JPN)
1902 - Samurai Dou 2 Portable (JPN)
1901 - Simple 2000 Series Portable - Vol 12 - The Hohei 2 (JPN)
1900 - Yamamura Misa Suspense Kyoto Kurama Sansou Satsujin Jiken (JPN)
1897 - Hakuoki Portable (JPN)
1895 - Tenchu San Portable (JPN)
1893 - Soul Calibur - Broken Destiny (JPN)
1890 - Konjiki no Corda 2 Forte Encore (JPN)
1889 - Saikyou Toudai Shougi Deluxe (JPN)
1888 - Ookamikakushi (JPN)
1886 - G.I Joe - The Rise Of Cobra (EUR)
1884 - Musou Orochi - Maou Sairin Enhanced Version (CHT)
1881 - Tales of VS (JPN)
1880 - G.I Joe - The Rise Of Cobra (USA)
1873 - Shinseiki Evangelion - Battle Orchestra Portable (JPN)
1872 - Armored Core 3 Portable (JPN)