Since I use iCal todos extensively, I wrote a little Applescript application to put the iCal todos (by calendar) into an IMAP mailbox using Apple Mail. I don't yet have my iPhone, but this should work. It allows you to add todos from the iPhone, by copying a draft mail to the "todos" folder. And it updates the todos folder with all the modifications to iCal todos every time it is run.
I guess this is a bare bones version of what Leopard promises. Very limited, but sufficient to know what you have to do - to mark them completed - to add new ones on the fly. Modifications of an existing todo from iPhone are not supported (it won't be synced back to iCal) - if there's enough interest, I might improve it a little - but hopefully Leopard will make that unnecessary.
Give it a try if you want, it is free. But only if you have an IMAP account configured on both your Apple Mail and your iPhone.
http://homepage.mac.com/bharley/BenAppleScripts/FileSharing19.html
I guess this is a bare bones version of what Leopard promises. Very limited, but sufficient to know what you have to do - to mark them completed - to add new ones on the fly. Modifications of an existing todo from iPhone are not supported (it won't be synced back to iCal) - if there's enough interest, I might improve it a little - but hopefully Leopard will make that unnecessary.
Give it a try if you want, it is free. But only if you have an IMAP account configured on both your Apple Mail and your iPhone.
http://homepage.mac.com/bharley/BenAppleScripts/FileSharing19.html