While it is a good thing to read books about Buddhism I believe that it is important to read Buddhist scripture. We are blessed to be able to read a large number of Buddhist scripture in English translation these days. In fact many sources are now available on the web.

Pali Canon
Mahayana
Non-Canonical

The Pali Canon

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Most of the Pali Canon is available at the Access to Insight website. This is a great boon! It includes indexes to the Suttas. Great blessings to all those involved in making this material available. As a minor note I believe there are better translations, but this does not detract from the achievement.

Of personal interest are the following Suttas

Dhammacakkappavattana Sutta : the Buddha's first Discourse on the nature of his enlightenment.
Upanisa Sutta. Samyutta Nikaya XII.23 a little known but vital Sutta. Herein Nirvana - the goal of the disciple's life - is described in positive terms. This is important because elsewhere Nirvana is described in negative terms only. As well as the well known formula of 'cyclic' conditionality where we go from birth to death to birth, there is described a second type of conditionality which is progressive - in dependence on suffering arises faith, and in dependence on faith arises joy etc until Nirvana itself arises. It also confirms that both samsara and Nirvana are encompassed by Conditioned Co-production.
Cunda Kammaraputta Sutta. Anguttara Nikaya X.176. Cunda the Silversmith asks about purification, and the Buddha answers in terms of the ten skilful and ten unskilful actions. These are the precepts that members of the Western Buddhist Order follow.
Satipatthana Sutta : the foundations of mindfulness (sati) that essential ingredient in the Spiritual life.
Mahaparinibbana Sutta : the last days of the Buddha
Udana : probably the oldest material in the Canon.
Metta Sutta : a beautiful and moving description of metta.
Mangala Sutta
The Dhammapada is one of my favourite texts. It is terse and uncompromising in it's presentation of the Dharma. If you want to know what the Buddha was on about then this is one of the best places to find out. My personal favourite translation is by Juan Mascaro - he writes "In the Dhammapada we can hear the voice of the Buddha". There are several translations available online...

Mahayana Scripture

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A collection of Mahayana Sutras in English Translation
A directory of Mahayana translations in many languages
Tricycle Buddhist Review Sutra Links

Of personal interest:
The Heart Sutra
There are many English translations of the Heart Sutra
The Diamond Sutra
also see many other translations at A collection of Mahayana Sutras
Ratnaguna-samcaya-gatha (Verses on the Accumulation of the Precious Qualities of the Perfection of Wisdom). I can recommend the translation (Conze's) and commentary in Sangharakshita's book Wisdom Beyond Words.
The Sutra of Hui Neng : a translation of chp. 1
The Vimalakirti Nirdesa : a definitive translation of a classic Mahayana Sutra.

Non-Canonical Sources

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Vissuddhi Magga of Buddhaghosha : this is a monumental and authorative guide to the Theravada. I am particluarly interested in the sections on meditation. The two main meditation techniques which I practice The Mindfulness of Breathing and the Metta Bhavana were taught to me in exactly the way set out by Buddhaghosha.
Bodhicaryavatara by Santideva : a sublime work. Go for the translation by Andrew Skilton, though the Bachelor translation is also good. Matics, while at times capturing the poetic intensity of the text is often impenetrable. An introduction to Santideva and his text are here. I particularly enjoy the chapter on Ksanti.
Tibetan Book of the Dead : homepage of a museum exhibit.
I prefer the Trungpa-Freemantle translation. I particularly like the six root verses.