This may not be news to many, but since I own a psp go with ofw 6.37 - it's good to know:
Iso2eboot (google it; it's abundantly available) is a program that patches your isos with a fake sign and converts them to eboots, making them playable on any ofw and any psp. The reason this isn't widely considered to be a solution for fws with no HEN available is because the isos have to be under 720mb to successfully convert.
However...
Many isos that are between the 750 to 900 + mb range can be trimmed-down in umdgen, poweriso, etc. and repacked to fit the criteria. By deleting the update folder, the boot.bin, and other non-essential audio/video files, you can make decent games fit. Por ejemplo:
Disgaea 2: DHD went from 800mb to 710 by deleting update, boot.bin, and 1 or 2 load-animations.
GTA: Chinatown Wars went from 880mb to 690 by deleting update, boot.bin and radio stations
GTA: LCS - 1gb to 690 by deleting update, boot.bin, radio, load-animations and a few others.
So while you probably won't be playing your ghost of Sparta, peace walker, or dissidia isos - your psp go w/6.37 ofw is certainly not a total wash for now...
X360 - Jasper revision: modded
PS3 fat model w/250gb upgrade
Wii: soft modded w/320gb backup
PSP 2004: 5.50 gen-C prom
PSPgo : 6.37ofw w/27 converted isos
3DS w/SSF4, waiting on the edge of my seat for ocarina 3D and Res. Evil: Mercenaries 3D
