Four of Australia's most scenic railway trips are celebrated in the Great Australian Railway Journeys stamp issue.

Australian trains cross the continent east to west and south to north, covering great distances over often isolated and difficult terrain. They also cover much smaller distances in rugged and precipitous mountain country.

The great Australian railway journeys featured are:

• 55c - The Ghan
• 55c - West Coast Wilderness Railway
• 55c - The Indian Pacific
• $2.10 - Kuranda Scenic Railway

The World Expo Shanghai China 2010, otherwise known as Expo 2010, held in Shanghai, China from 1 May to 31 October, 2010. This is the first ever World Exposition to be held by China and is another major event after the 2008 Beijing Olympics.

Royal Mail are proud to announce the third part of our Kings and Queens series: The House of Stewart. This formidable Royal house ruled Scotland for nearly two centuries before Elizabeth I died without issue, leading to the Union of the Crowns. The First Day Cover features the Special Stamps for seven Monarchs, plus a filler card containing a fascinating biography of each Stewart.

As Royal Mail's contribution to the International Year of Biodiversity in 2010, this is the fourth part of their Action for Species series: Mammals, which features ten of their most engaging yet endangered indigenous mammals. Conservation efforts have been enormous however, and the stories of their success make this delightful Special issue particularly heartwarming.

This venerable institution has been looking after our four-legged friends since 1860, rescuing and re-homing tens of thousands of dogs and cats. So not only does Battersea really deserve its own Special issue: it has also helped us to create some of our cuddliest ever Special Stamps.

Butterflies belong to a group of insects known as Lepidoptera and are mostly day flying. They are most active during the warmer part of the day. They are notable for their unusual life cycle with a larval caterpillar stage, an inactive pupal stage, and a spectacular metamorphosis into a familiar and colourful winged adult form. In this stamp issue, 4 butterflies in Singapore, namely the Blue Glassy Tiger, Common Birdwing, Common Posy and the Tailed Jay, are beautifully illustrated and featured.

On 6 May 2010, the United Nations Postal Administration issued six souvenir sheets of four stamps each (for a total of 24 commemorative stamps) on the theme "One Planet, One Ocean", on the occasion of the fiftieth anniversary of the International Oceanographic Commission (IOC).

The United Nations declared 2010 to be the International Year of Biodiversity. The purpose of the International Year is to raise awareness of the importance of biodiversity and the consequences of its loss.

We rely on this diversity of life to provide us with the food, fuel, medicine and other essentials we simply cannot live without. Yet this rich diversity is being lost at a greatly accelerated rate because of human activities. This impoverishes us all and weakens the ability of the living systems on which we depend to resist growing threats such as climate change.

The International Year of Biodiversity is a unique opportunity to increase understanding of the vital role that biodiversity plays in sustaining life on Earth.

On 22 April 2010, in Kansas City, Missouri, the Postal Service^™ issued a 44-cent, Love: Pansies in a Basket commemorative stamp, designed by Derry Noyes of Washington, DC.

The 2010 Love: Pansies in a Basket stamp features the image of a white woven cart filled with deep and light purple pansies and green foliage. The floral design is a detail from a watercolor created by the late Dorothy Maienschein, an employee of Hallmark Cards, Inc. Introduced as a Mother's Day card in 1939, Hallmark reissued the design as a friendship card in 1941. Since Hallmark began tracking sales in 1942, almost 30 million cards with this pansy cart design have been purchased; more than any card in history. The word "LOVE" adorns the left side of the stamp.