This is simple but incredibly useful – Photon Flash Player for iPhone - Flash Video & Games plus Private Web Browser Review

It always surprised me when new native browsers came out for each version of iOS with no flash capabilities. Yet this app has been able to do it splendidly even on my 4th Gen iPod Touch. This company/app is apparently so ahead of its time that major companies still haven't figured out how useful mobile flash functionality is. EDIT: READ THIS IF YOU GET A "Firefox crashed" ERROR. You need to try different engines (the setting with "v1" through "v4" as options). I usually use the "v2" setting as it seems the most versatile. To compensate for differences in different device capabilities, I think the company put this option in so the user can decide which flash engine works best for their device. It's smart thinking in my opinion.
Review by Yes I'm Groovin on Photon Flash Player for iPhone - Flash Video & Games plus Private Web Browser.