[bawolff]

Wouldn't a good conjecture be anything that's interesting if true. General bonus points for if intuitively it seems like it should be obviously true (or false) but yet is hard to prove or if proving it is true would allow you to prove lots of other interesting statements.

[alisonkisk]

Sure. Define "interesting".

What's interesting to me is probably in a standard textbook already.

[bawolff]

If it is in a standard textbook, than its almost certainly interesting (although probably not a conjecture unless its a pretty advanced textbook)