Over the years, I've given lots of talks on various Buddhist themes. Most of them are available on the FreeBuddhist Audio website. If you search for me under my Buddhist name, Kulaprabha, you'll get the full list of about 30 talks. But here is a sample from that list which I'll add to from time to time. The links take you through to FBA which is the easiest way to add them here.
Brahma Viharas and the Key Moment: The Brahma Viharas is a mandala of four meditation practices on loving-kindness, compassion, sympathetic joy and equanimity. Each practice is different in its primary focus but simillar in its means of focussing - asking us to consider ourselves, a good friend, someone we know but not well, someone we dislike or who dislikes us, and finally asks us to contemplate all beings wherever and in whatever circumstances we can imagine them. So there's a lot to contemplate in these meditations.
The talk focusses on the Dharmic context of the Brahma Viharas and how to bring that context into our sitting practice. You can find lead throughs of the actual meditation practices elsewhere on Free Buddhist Audio. Search for metta bhavana (loving kindness), karuna bhavana (compassion), mudita bhavana (sympathetic joy) or upekkha bhavana (equanimity). Listen to it here, running time 1h 5min: Brahma Viharas and the Key Moment
The Alchemy of Happiness: in the blurb this is described as a thoughtful take on the positive emotions cultivated in the 'Brahma Vihara' meditations. Hopefully it's thoughtful. At the moment I can't remember what's in it! It was given at the Western Buddhist Order convention, 2007. One of a series of talks on the Brahma Vihara meditations. Running time 1h: The Alchemy of Happiness