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try this site from canada; http://www.geobase.ca/geobase/en/data/imagery/index.html;jsessionid=D0E0B2ED7351A2B123DCA70FEDC411E2 they have free spot imagery

VietCong, my friend ! you can download eCognition software from this forum. Just give a search on the forum ! About classification techniques using eCognition, there are a lot of information on eCognition comunity or on the eCognition web-page. Also you can find some interesting articles about land use classification with eCognition on internet (Google). There are some tips and tricks using this software, but you can find documentetion on most of the links that I have mentioned above So, good luck and good work ! Vietnam = nice and interesting country, VietCong = nice computer game ! pac-pac !!

for hosting, you definietly need a dedicated server for that, a spatial web server request need a high resource Im not really into in Map server, some comparison i found on wiki : http://en.wikipedia.org/wiki/Comparison_of_geographic_information_systems_software#Map_servers in general, gis de facto is ESRI, so if you have the budget, then ArcGIS Server is the best choise, but in my opinion, any descent map server like you mentioned can serve most mapping function you needed, for me, Im now learning mapserver, its open source and in my country we have many tutorial books for this stuff