Here's an ethernet device that could possibly do the job if you combined it 
with an arduino board and a temp sensor: 
http://shop.moderndevice.com/products/jeelabs-ether-card.
I noticed Jeelabs also has a small temperature board also.  




>________________________________
>From: Igor Chudov <[email protected]>
>To: Enhanced Machine Controller (EMC) <[email protected]>
>Sent: Friday, July 22, 2011 12:39 PM
>Subject: [Emc-users] OT -- Ethernet thermometer?
>
>I would like to buy a thermometer that could serve the reading of ambient
>temperature over Ethernet. I searched and have not found anything with a
>sensible price (say, under $50).
>
>Any idea if such a thing exists?
>
>thanks
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10 Tips for Better Web Security
Learn 10 ways to better secure your business today. Topics covered include:
Web security, SSL, hacker attacks & Denial of Service (DoS), private keys,
security Microsoft Exchange, secure Instant Messaging, and much more.
http://www.accelacomm.com/jaw/sfnl/114/51426210/
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