I'm aware of the Roosters v Souths derby game. What other rivalrys are there in the NRL? Does any other rivalry come close to this one in the NRL?

Sharks V St's
Bulldogs v Parra

but they are pretty timid compared to the English derbies.

and once upon a tiime

Norths v Manly

alas no more. But if Central Coast get in in 2013, then it may be rekindled.

Brisbane vs North QLD. (NQ has a lot of support in Brisbane since they were the only two teams in QLD for so long).

Other local derbies:
Brisbane vs Gold Coast
Canterbury vs St Merge
Souths vs Wests (Balmain)
Parra vs Penrith

I think Origin probably takes the shine off some of the derbies. The first fixtures people look for in Aus is SOO but in this country I look for when we play Saints and Warrington. Those are the games I most look forward to due to the atmosphere and rivalry.

I think the crowd makes our rivalries far better. We hate each other and sing songs at each other. This doesn't seem to happen in aus.

Manly vs Parra

Can't believe no one's mentioned this one

Manly vs Western Suburbs (the old Fibro's vs Silvtertails)

Manly vs Melbourne is generating into a healthy rivalry.

Canterbury vs Roosters

I thought we were only listing local derbies, not all rivalries. However after re-reading the OP I see that’s not the case.

I had it in my head that Cronulla v St.George was a rivalry for some reason?

one of the CEO's cut up the opposition's jersey's on tv.

The funniest thing is the Sharkies calling the Dragons choker's when they haven't won anything.

Funny 44 years and counting.

I remember some sharks fans giving it to North Sydney fans about how they hadn't won a premiership since the 1922. Oh the irony.

There is a Manly chant when they play each other that contains 44 years and won .... all.

Some of my mate's when Manly play's the Sharkies(@ Shark Park) look for the premiership room needless to say it doesn't go down well with the locals