I have listed few cloud based service providers for SharePoint. If you guys came across any other cloud based service please add it in comments. I am just trying to put all cloud service provider in one place.

Microsoft Office 365

Microsoft is committed to delivering business-grade cloud services that work together to support new levels of innovation, efficiency, and agility for your organization

http://www.microsoft.com/en-gb/office365/online-software.aspx

American Data Technology

You as a client benefit from our proven track record of 15 years expertise as a web hosting services provider.

http://www.localweb.com/

Igroup Hosted SharePoint

They love SharePoint and they use the platform widely within their business. They aim to stand out in our market by offering our products and services in the most self-supporting and responsible way they can.

http://www.sharepoint-cloudhosting.com/

Goiwx

Goiwx is a cloud hosting services provider specialized in ERP, CRM and other front and back office solutions that you own or want to use.

http://www.goiwx.com/

Quantix innovative IT Services

Quantix is one of the UK’s premier providers of, Managed Cloud Services and Infrastructure Solutions for Enterprises and Independent Software Vendors.

http://www.quantix-uk.com/

724 Internet Solutions

724 is one of the oldest Cloud Computing Providers. In business since 1996, and Hosting SharePoint since 1999,

http://www.724hosting.com/

Rackspace Hosting

Rackspace Cloud offers four hosting products: Cloud server for on-demand computing power; Cloud sites for robust web hosting

http://www.rackspace.com

Pay Per Cloud

PayPerCloud is a full service cloud hosting company. Their solutions are delivered and backed up with EXPERT level technical support unmatched in the industry

http://www.paypercloud.com/

WEB HOSTING UK

The number 1 company in the UK offering reliable and affordable web hosting solutions

http://www.webhosting.uk.com/

Red Ember Solutions

They are dynamic Perth Company specialising in custom solutions tailored to your businesses exacting requirements.

http://www.redember.com.au/