a free host that is good is:

http://www.110mb.com

no ads but no mysql
5 gigs of space
file size limit though 8mb
great host
300gb bandwidth


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another good one is:

http://www.unlimitedmb.com/

i dont think that there is ads
5 gigs of space
smaller file size limit 2mb
has mysql
multiple sub domains
500gb bandwidth