How do I send multiple photos from my iPhone camera roll in a single email?

I'm sure I'm missing something obvious, but:

• From the camera app, I can select a photo, and then hit the send button to create an email with that photo in it.
• From mail, I can't find any way to add an enclosure without having started in the app that owns it.

I want to send multiple photos in a single email.

since software update 3.0 you can select multiple photos copy them and paste it as email body, in iOS you can SHARE it as email.

[I posted this answer to address a followup question that appears to have been subsequently deleted. I will leave my answer up as it does add a more complete details than the prior answer, which was correct albeit terse.]

You can mail multiple photos, but not an unlimited number. I assume to limit the overall email message size, as there could be limits on some mail gateways.

Open Photos app, select "Camera Roll" (or other album) from your albums. Touch the "Edit" button, and the screen heading should change to "Select Items." You can then select multiple photos, then touch "share" and select "Mail". If you don't see "Mail" as one of the options, then you have selected too many photos to attach to a single message. Try just two to see what it should look like. On my phone just now I was able to choose 5 and still have Mail as an option, but if I chose 6, then Mail was not an option.

From mail, I can't find any way to add an enclosure without having started in the app that owns it.

You can now do this in iOS 6. In a new mail message, tap and hold in the message body, then tap the right arrow in the overlay and tap "Insert Photo or Video."