CloudPhone is good, not too expensive and easy to use. There are a few limits however.... CloudPhone
Recently discovered this site for doing conference calls for free, have now used it for several conf calls with good success, Free Conference Calls
The number one mistake is one I have preached for a long time, treating employees like customers.
sending-secure-e-mails-out-of-the-database-ssltls-utl_smtp-openssl-acl-wallet
Using OSWatcher for system diags
Sometimes sending large files via email is not possible due to size limitations, many times you can do a "trial" where you can send a large file for free sometimes up to 2GB. Occasionally people will ask me how to get this accomplished.
I have used some of these and they are quite good to use in a pinch.
This one allows up to 4GB
Another alternative is to upload your files to google docs and send a link to the person to allow them to download it.......if you have google docs this is a great alternative
Here is an interesting situation for the cell single block physical read