a backgroundreader - http://www.ladyada.net/make/logshield/
> +/- 0.05 Deg. Celsius Accuracy
What is its range ? minimum maximum? This is very accurate
> Live Web Graph
Think you need a PC for that. check PHP Apache - http://www.apachefriends.org/en/xampp.html
> Adjustable Logging Rate (5 seconds - 24 hours)
Check a real time clock DS1307
PLease consider to decouple sampling rate and logging rate. Sampling rate should allways be maximal (e.g. 1/sec or 1/10 sec) to have a good alarm function.
> Over/Under Temp Alarms and Email Alerts
if you do PHP let the server do this.
> Configurable Web Serv Port, LAN IP, Etc
> Auto periodical FTP upload of data sets (For backup)