Synching Libraries on two macs

I did a really stupid thing. I have two macs, my powerbook and an iMac. My iTunes library was on my powerbook and I copied it to my iMac. No problem... but over the last couple months I added about 100 songs to my powerbook and a different 100 songs to my iMac. Is there an easy way to get all the songs on both computers without having to re-import them and without losing whatever is different?
In other words I want the library in both computers to be identical and I'm afraid if I try and copy one to the other I might erase songs from one or the other instead of just adding the missing songs.
Thank you

Yorgo
Try the following:
On Machine 1 set up a Smart Playlist based on the date you added the songs... before Today and After the last time you synced.
ON machine Two do the same.
Now you have a list on each machine of what has changed. Copy over and back.
Regards
TD

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Merge?
Do you mean 'sync' libraries
The general term means when two Libraries (A and B) are compared and files in Library A are copied to Library B, while files in Library B are also copied to Library A so that both Libraries are identical.
This is bi-directional copying and you cannot do this with automatically with iPhoto. No Syncing software is capable of parsing the iPhoto Library in this manner. One or both of your Libraries will be damaged if you try this.
The nearest you can get to syncing is to use iPhoto Library Manager to move files/Albums/Events plus assoicated metadata between Libraries. This process cannot be automated.
The Export/Import route will not get your versions.
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TD

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I've read some older discussions on synching iPhoto between two Macs but is there anything new on this. I'd like to have the same library on both Macs.

Brie Fly is right. You can't do a straight sync. Doing so will make sure each folder in each library has the same files but it can't sync the database files that tell iPhoto which photos are where. Each library will just appear the same and may eventually have problems with all those "unofficial" files in it's library. You can use the paid version of iPhoto Library Manager to merge photos from each library into the other. It would not be automatic in that you'd have to know which are new. You might use the "Last X rolls" feature to do that. But it will copy them and maintain the rolls, album, keyword and other metadata information. I've not used it but many users have reported successful merges with it.

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Welcome to the Apple Discussions.
Exactly what do you mean by sync? Do you mean one way copying? As in I organise and import pics on one machine only, and would like the changes visible on the other?
Or do you mean I want to import and organise on both machines, and have the changes reflected on either? You cannot do this. If you try and sync the database files they will be corrupted.
So a little more info might help us help you.
Regards
TD

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Periodic posts on people wanting to do something like this and no good answer.
All that information is in the library files.
What are the iTunes library files? - http://support.apple.com/kb/HT1660
More on iTunes library files and what they do - http://en.wikipedia.org/wiki/ITunes#Media_management
What are all those iTunes files? - http://www.macworld.com/article/139974/2009/04/itunes_files.html
Where are my iTunes files located? - http://support.apple.com/kb/ht1391
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