If you're willing to carry a laptop around, you can use Audacity to record audio that feeds into a microphone that you plug into your microphone jack. (Many laptops have a built-in mic also).
Depending what you are trying to capture you may consider using screen recording software. If your slides are on your laptop and you can plug in a mic you could use:
Either of these will record what is being shown on your screen as you lecture (your slides), and will capture the audio too if you have a mic. It records the whole screen, so if you show an image from outside your presentation it will capture that too.
Once you're done you can export the whole lecture (slides sync'd with sound) as a Flash file for example that can be viewed in almost any browser.
These tools are often used by software developers to make tutorial videos, etc...
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