to migrate (i.e. export and import) any desired content and contacts from your old wildblue.net account to GMail.
Once done, send a message to your contacts using your Gmail account informing them of the new email address. Forwarding your email from the wildblue.net account to your gmail account will assist in isolating those who didn't get the memo.
You'll need to go through and manually change the email address for any online accounts you may have (e.g. credit cards, insurance, banks, etc.). Forwarding as noted will help identify those you may have missed.