Do I have to have an HDTV for a PS3?

May be...

No you don't have to have a HDTV on the PS3, but to get the most out of the PS3, a HDTV is recommended. The PS3 is an HD console and it was really meant to be played on a HDTV, but it's not necessary.

no but it looks way better on a hdtv.

No, but you should for the amazing graphics that your paying so much for.

Not at all, you just wont be able to get the full experience on a regular television. There really is an amazing difference between regular and HD gaming, not to mention the clarity of Blu Ray HD.

no my tv is really crappy when i play dvd's icant see the image but with the ps3 i can see perfectly

Not at all, i have one myself. I mean of you only have the HD cables you would have to have an HDTV, but i would highly recommend getting all HD because there is a lot better game quality, and not as much lag going on in the game. Also, everything's bigger in HD

No you don't need an HDTV but it does make the graphics look better if you have an HDTV that displays in full HD/1080P !