Can I setup kind of a mailing list / newsletter from my Gmail / GApps account?
I use Google Groups with my friends. If you have Google Account (e.g. you already use Gmail), you can use it. It's basicaly a simple mailing list with on-line searchable archive.
i'm following up from the last user's comment on a newsletter creator for Gmail called http://Flashissue.com (full disclosure - i'm the founder).
we've had a HTML authoring tool for Gmail for a while - it lets you create a full styled newsletter and helps with finding and adding content to the newsletter rapidly. you then send out the newsletters through your gmail contacts.
we've had a lot of requests for "mailing list" support and analytics for newsletters sent through gmail. we'll be adding both shortly.
the web app is free to use. let me know if you need anymore help.
BTW you're best off installing it through the chrome store using this link as suggested above:
They already have chrome extension that lets you export the existing newsletter to a new gmail email message (the new product seems to offer more gmail integration such as mailing lists and analytics)
(*I'm not affiliated, just know one of the developers who work there, they seem likea great company)