The news items are titled automatically from the email subject line, so it would help if you can make this informative - and if you intend to send items regularly in one month, a date in the subject line in iso format is a help : i.e. 2006-04-20.
Any textual info should be as plain text or html, so it is searchable, not in graphical format. There is no problem with it being in nice fonts/colours, and laid out in a tidy display format, see examples on the news pages.
Please do not embed graphics or attachments in your email, they are a lot of work to process, to display on the web, and usually take up a lot of web space unless I re-size them.
If you want to include graphics, posters, flyers, etc., find somewhere on
the web that you can upload them to, and then just put a pointer
to this location in the email.
This way people have a choice as to whether to download them or not,
and they then cause me no extra problems.
To read more on how to do this, please see : Having images, photos, posters and flyers in emails for the web