REstoring from old time machine backups on new install

Hi, I've been looking for good documentation on this and haven't seen an answer yet.
I want to blow away and reinstall my OS (10.5.1) I made a full backup to my time machine disk and I had planned on reinstalling the OS and all my apps for a clean start, then when the time came to move my photos and itunes back just connect my time machine disk to the new installation and copy the data back. Once I was satisfied that everything I needed was restored from the time machine dist to the new install I would go ahead and re-enable time machine on the new install and blow away my old backups starting from scratch. Has anyone done this yet? I do not want to plug in the old time machine disk and not be able to access the data that was created by the old installation. I would be bitter to say the least. Before anyone suggests another means of backing up I have thought of that, but, I'd like to see if this works.
I understand the scenario of beginning an install and choosing to restore that way, but, the reason I'm reinstalling is to start with a fresh OS form scratch an be able to restore selectively.
Thanks for reading my wordy post, I look forward to hearing back!
Thanks again

I think I'm facing the same issue as you. I ran Time Machine on my MBP. Now I've bought a new iMac. I started it with the Leopard CD and instead of installing Leopard on the new machine, I selected Restore from Time Machine Backup (or something like that). Everything from my old machine is now on my new machine. Sweet!
Only one problem. I've now enabled Time Machine on the new iMac and it tells me that there's not enough room on my external 320 GB drive for its first backup. It also tells me that its first backup will be 112 GB in size! This large size leads me to conclude that Time Machine will not add to the backups from the old MBP, but instead start a new series for the new iMac. To confirm this, I looked on the backup drive.
On the external backup drive, there are a series of 4 KB files, one for each machine that has previously been backed up. These names are nearly identical to the machine's MAC address (which you can find by open Network Preferences > Airport > Advanced). Time Machine will create a sparsebundle file for each machine backed up over the network; its name will have the format MachineNameMacAddresssparesebundle (Backups made when the backup drive was connected locally are saved in a folder called Backups.backupdb). So, to delete an old backup from a machine you're not using any more, you need to delete the 4 KB file containing the machine's MAC address, AND either the sparsebundle file OR the machine names' folder inside the Backups.backupdb folder.
Hope this helps.

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