Mac 10.6 Hardware/Software issue, will not Boot

So last night I am working away on my Macbook (2.4 c2d 4gb with a 500gb HD installed last month) and I have an iCal error, which I was not using, and a dock error. Then I check something on my widgets and they will not load. So it was late so I just shut it down and call it a night.

- Where the real story starts -
This Morning I boot it up and nothing. So I shut it off again, hold the option key and boot up again. Now when I get to where I select the OS I only see my Windows 7 partition, no mac partition. So I boot into windows, says it encountered an issue, but all was ok. So I shut down restart into windows and it works just fine.

I then put in my snow leopard disk, boot to that use disk utility and it says my Mac partition is unmounted. So I click the Repair button and it goes through finding a ton (50+) of Missing Thread Record and Invalid Directory Item Counts. Then it says my disk is unrepairable. So I shut down, booted into windows and I can access anything, so it seems, from the mac side just fine. So I called it a morning and drove to work.

So...

Can I repair my drive to make is usable? (Most Preferred)
Should I just reinstall the Mac OS in conjunction with my 2 week Time Machine backup? (I would have to copy a few files from the Windows side that are not backed up, easy enough though)
Chances that this is a hardware issue and I will just have this issue again and again?
What do I do?

Thanks!

 

I have backups. Windows side seems to be fine at the moment, thats why I am wondering if something has just corrupted, but the drive itself may be ok.