I don't think the transaction I am referring to is listed there. I had an incoming and outgoing transaction of the same amount (2.44) in that wallet yesterday, but this is a third and separate one. Here is all the info my wallet tells me about this specific transaction:

Status: 0/unconfirmed
Date: 4/1/2013 14:22
From: unknown
To: 15s17qYWvj9vTJrjKnywGPiduM7NvbhNx7 (own address)
Credit: 2.439 BTC
Net amount: +2.439 BTC
Transaction ID: 2176854c0ed2e2a8e6c2f4aeb429e4548452ba59088cc63ff36634cdeae062a4

It looks as though blockchain doesn't see that transaction ID at all.... Thanks for your help so far!