Amazon Elastic MapReduce
http://aws.amazon.com/elasticmapreduce/
BigInsights (IBM)
http://www-01.ibm.com/software/data/infosphere/biginsights/
GoGrid Big Data Solution
http://www.gogrid.com/solutions/big-data
Infochimps
http://www.infochimps.com/
Joyent Solution for Hadoop
http://joyent.com/products/joyent-cloud/features/hadoop
Mortar Data
http://www.mortardata.com/
Skytap
http://www.skytap.com/
Unified Analytics Service (Sungard)
VertiCloud
http://www.verticloud.com/
Windows Azure HD Insights (Microsoft)
https://www.hadooponazure.com/