Compiled by JOHN COLLINS

Disneyland's Black Sunday

WATCH: The Disneyland brand is so powerful that it's hard to believe that the original incarnation outside Los Angeles was an absolute disaster on its opening day in 1955. Walt Disney tore up the business model for theme parks – having a single entrance, charging for admission – but a catalogue of disasters including forged tickets and a plumbers' strike ensured the launch was less than auspicious.

In this video for Wired.com, Disney veterans remember the day they nicknamed “Black Sunday”.

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Why a successful web service failed

READ:If you have any intention of ever running or advising a web-based business, this post by Todd Agulnick, co-founder and chief techie with Xmarks, is essential reading.

Xmarks, which allows users to share their bookmarks across multiple web browsers, has been adding 3,000 users a day. However even with its installed base of two million users, it has failed to generate any meaningful revenues and will shut down before the end of the year.

In this frank post, Agulnick shares some of his war stories of what went wrong and why.

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Ingenious Ireland walking tours

DOWNLOAD:Sometimes we take for granted the things around us that tourists rave about. The series of audio tours – available to download to your phone, iPod or other device in MP3 format – may be just the poke you need to get out and explore your environs. Mary Mulvihill, author of the Ingenious Ireland, has voiced the guides and provided the content.

Prices range from €9.95 for the Hill of Tara, €4.95 for the Dublin walking tour and free for the Trinity and Dún Laoghaire tours.

ingeniousireland.ie

Nokia's Ryder Cup app

INSTALL:Just in time for the Ryder Cup, Reuters has released a dedicated sports app for Nokia phones. Not so much as an app but a pointer to a mobile version of the Reuters Sport mobile site, it will still ensure you have the latest news from Celtic Manor in Wales all weekend.

Free at the Ovi store.

http://bit.ly/c3AXvr