Most interesting one is Turkey. I think this is a recent change in their law. The Turkish Ministry of Foreign affairs website states that Indian passport holders with a UK/Schengen or US visa can get a 1-month visa upon arrival. I wanted to visit Turkey back in April 2010, and then I was advised by the embassy, the travel agent and the Turkey MFA website that I do need to apply for a visa, despite having a UK resident visa.
Here are some interesting excerpts from the Wikipedia list ....
- Egypt (Sinai resorts area)
- British Virgin Islands
- Trinidad & Tobago
- Hong Kong
- Sri Lanka
- Ireland -- special case -- only if you have a valid UK tourist/business (short term) visa.