the prehistoric article from december last year (http://toucharcade.com/2008/12/20/prehistoric-adventure-secret-of-the-lost-cavern-coming-to-iphone/) shows a relly fun looking game. it hasn't come out though. has anyone heard anything about it?
Unfortunately I don't know anything about the iPhone version of this game, but I've played it on the Pocket PC, and I wasn't overly impressed. I think you'll be a lot happier with games like Syberia and Return To Mysterious Island when they come out.
Although I never played the original, I was hoping it would be reworked and made a little better for the iphone version. I guess I'll have to wait for reviews if it ever does come out. I wonder when Syberia is coming?
According to the Tetraedge web site (the people porting both games I mentioned to the iPhone), RTMI will be coming out in April, and Syberia in June. I would actually recommend RTMI over Syberia.