Can someone tell me what the difference is between the Light, Sweet Crude chart here and at PeakOil.com?

I copied these two images the other day:

This one was from TOD:

and this was from PeakOil.com:

They look like identical charts apart from the numbers at the side.

Which one is 'right'?

I think PeakOil.com is for a future month.  I can't remember how far in the future, but IIRC, their chart isn't looking at the current contract.
Yes, but trading on two different months wouldn't look identical, would it?
the spread can actually vary quite a bit over months...
Not identical, but they often look very similar.  Since the same events affect futures contracts.  Especially since it's not very far in the future.

Here's the link to the PeakOil.com chart, if it helps:

http://www.advfn.com/p.php?pid=staticchart&s=NYM^CLJ6&p=0&t=7&dm=0&vol=0&cb= 1138080214

yep, that's J6.  I don't know off the top of my head if that's April or May, but a search on CLH6 and CLJ6 would yield the answer.
Jan - F, Feb - G, Mar -H, Apr - J, May - K, Jun - M, Jul -N
Aug - Q, Sep - U, Oct -V, Nov -X, Dec - Z

April crude is about 75 cents higher than march -seasonal factors, etc (Natural gas months are very different depending on time of year, crude are very similar)

is it just me or are those letters completely without meaning?
No, it must be you. I'm pretty sure there's a "g" in February.
does peakoil.com have a different month?  Ours is H6, which is March.  The February contract closed on the 23rd of JAN...

or perhaps they are looking at April?  can you dig out the url from the source?