Since "where are YC funded companies hosted" is a common question, I'll answer that too, based on the list of YC-funded companies at http://www.ycombinator.com/faq.html:
$ echo reddit.com loopt.com clickfacts.com textpayme.com snipshot.com inklingmarkets.com flagr.com wufoo.com youos.com likebetter.com thinkature.com jamglue.com shoutfit.com scribd.com weebly.com virtualmin.com buxfer.com octopart.com heysan.com justin.tv iminlikewithyou.com socialmoth.com xobni.com versionate.com adpinion.com anywhere.fm fuzzwich.com bountii.com auctomatic.com disqus.com draftmix.com webmynd.com rescuetime.com reble.fm heroku.com tipjoy.com addher.com 8aweek.com | xargs -n 1 | lam -s 'www.' - | xargs -n 1 host -t a | grep 'has address' | cut -f 4 -d ' ' | xargs -n 1 whois | grep OrgName | sort | uniq -c | sort -srn | sed -e 's/OrgName://'
8 Amazon.com, Inc.
6 SoftLayer Technologies Inc.
4 ThePlanet.com Internet Services, Inc.
2 NoZone, Inc.
1 BitPusher, LLC
1 Columbus Network Access Point, Inc.
1 Global Netoptex, Inc
1 Layered Technologies, Inc.
1 Performance Systems International Inc.
1 RackForce Hosting Inc.
1 ServePath, LLC
1 Slicehost LLC
1 Time Warner Telecom, Inc. Amazon.com, Inc. 7
youos.com
jamglue.com
shoutfit.com
socialmoth.com
webmynd.com
heroku.com
8aweek.com
SoftLayer Technologies Inc. 5
scribd.com
xobni.com
anywhere.fm
bountii.com
disqus.com
ThePlanet.com Internet Services, Inc. 5
snipshot.com
virtualmin.com
heysan.com
adpinion.com
reble.fm
Hurricane Electric 3
weebly.com
octopart.com
auctomatic.com
Internap Network Services 2
loopt.com
likebetter.com
NoZone, Inc. 2
flagr.com
thinkature.com
Peer 1 Network Inc. 2
rescuetime.com
addher.com
ServePath, LLC 1
reddit.com
American Digital Network 1
fuzzwich.com
Columbus Network Access Point, Inc. 1
versionate.com
Performance Systems International Inc. 1
justin.tv
Global Netoptex, Inc 1
clickfacts.com
RackForce Hosting Inc. 1
draftmix.com
Time Warner Telecom, Inc. 1
textpayme.com
Logicworks Corporation 1
inklingmarkets.com
Layered Technologies, Inc. 1
buxfer.com
Rackspace.com, Ltd. 1
iminlikewithyou.com
BitPusher, LLC 1
wufoo.com
Slicehost LLC 1
tipjoy.com #!/usr/bin/env ruby
domains = %w{reddit.com loopt.com clickfacts.com
textpayme.com snipshot.com inklingmarkets.com flagr.com wufoo.com
youos.com likebetter.com thinkature.com jamglue.com shoutfit.com scribd.com
weebly.com virtualmin.com buxfer.com octopart.com heysan.com justin.tv
iminlikewithyou.com socialmoth.com xobni.com versionate.com adpinion.com anywhere.fm
fuzzwich.com bountii.com auctomatic.com disqus.com draftmix.com webmynd.com
rescuetime.com reble.fm heroku.com tipjoy.com addher.com 8aweek.com}
orgs = {}
domains.each do |c|
whois = `host -t a #{c} | grep 'has address' | cut -f 4 -d ' ' | xargs -n 1 whois`
if org = whois.grep(/OrgName/).first
org = org.sub(/OrgName:\s/, '').strip
else
org = whois.split("\n").first.split("(")[0].strip.sub(/\s+[A-Z\-\d]+$/, '')
end
orgs[org] ||= []
orgs[org] << c
end
max_size = orgs.sort_by{|k, v| k.size}.last.first.size
orgs.sort_by{|k, v| v.size}.reverse.each do |o, ds|
puts "%-#{max_size}s %5s" % [o, ds.size]
ds.each {|d| puts "\t#{d}"}
end
puts
puts "%-#{max_size}s %5s" % ["Total # of Domains", domains.size]
puts "%-#{max_size}s %5s" % ["Total # of Providers", orgs.size]It's run by the same management team as ThePlanet, which is another great service, from what I hear.
If you want to scale bandwidth eventually, Amazon is the only game in town unless you want to beta test Google. Maybe Microsoft would also let you beta test if you asked nicely.
Is there anyone using enough bandwidth on Google App Engine to hit the bandwidth cap and start paying?
I use and would not recommend Mosso or MediaTemple.
I use and would conditionally recommend PHPWebhosting.com, Google App Engine, and RackSpace.
I use and do not have enough data to comment on AWS.