Turning off layers.

Just a quick 'Did you know?' for you. If you have to send .psd's to a client and are concerned about the size of the .psd, then there's good news.
By simply turning off the layers in your .psd's you can greatly reduce the file size you have to send. So, if you have all of your working layers on your file, simply click on the 'eye' icon in the layers palette and save. The recipient can turn back on all relevant layers when they receive it. An email about which layers to turn on might be a good idea at this point.
As an example, I had a 31mb file that I had to send to a client, and by simply turning off the layers, reduced it to 17mb.
Pretty cool huh? Hope this helps.