Slideshow format advice?

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I've been roped into providing some images for a slideshow.
I'm not producing the slideshow and I've no idea what equipment it'll be shown on - projector, tv or if it'll be via a computer or just something like autoplay jpg cd. Basically I'm in the dark because I can't seem to speak to the guy making the slideshow (and he doesn't contact me). Only info I have is size doesn't matter as can adjust as many mega pixels as possible (his txt msg, I don't know either ) and jpg format preferred.

Now the images are to be shown at a presentation evening. So I'd like to know I've done the best I can.

Question is, what size / resolution should I size/crop the images too?

Before anyone suggests it I did do a google query but got information overload. I thought I'd try and pick up from other peoples experience.

Thanks in anticipation
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...and the whirlwind is in the thorn trees, it's hard for thee to kick against the pricks...
Gibbs, what did Duckie look like when he was younger?

[Mr.Everready]

Just do 1600 x 1200, if he's doing all the work I'm sure that size would be ok for him.
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the undemocratically unelected mod of the Scottish section