Tiger Sites offers a Drupal hosting package.
Their hosting features shows a lot of unlimited features, which is either a sign of overselling or savvy business management (users rarely take advantage of such unlimited plans, so they can be managed to maintain a reasonable service if TigerHosting plans their capacity appropriately).
TMDHosting provides low cost shared hosting plans for as low as $4.99/month if you sign up for a 2 year agreement.
Host Color provides Drupal hosting plans with an automated "one click" installer for Drupal.
They have a wide variety of plans, from a relatively simple and for budget conscious customers who have simple needs (i.e. just one or two websites). all the way to Virtuozzo VPS Hosting ($19.95 - $69.95) and dedicated servers (starting at $99/month) in data centers in Indiana, U.S. and Amsterdam, Netherlands. Drupal users get 10% instant rebate with any VPS hosting plan or Dedicated server.
MidPhase Hosting offers a variety of packages including:
Shared Hosting, Virtual Private Servers, and Dedicated Hosting.
Shared Hosting (Mega-PHASE) provides:
Monthly price: $7.95.
Sign up for: MidPhase Hosting.

Blue Host provides several compelling features starting at $6.95/month.
The A2 Hosting base package is a shared hosting plan with:
The most important features, in my opinion are:
Siteground sponsored Drupalcon Barcelona and provide Drupal Themes.
More hosts listed in the handbook
This site is built to provide a list of various hosts that are available for Drupal. In truth, Drupal will run on the vast majority of web hosts since it is based on PHP and MySQL/PostgreSQL which are the most common programming language and databases available on servers on the internet. The hosts listed on this site are especially well suited in some way:
As a means of raising money to help support its mission the Drupal Association has created affiliate partners with a variety of Drupal hosting companies. If you purchase hosting with one of these companies by following a link from this site then they will give a bit of money to the association. Great deal. Many of these hosts are also involved with the Drupal project in other ways like providing modules or themes or being membes of the Drupal Association.