After logging in, the user should be directed to the page she started on rather than her profile page.

This might be done easily if a token can be used ti pull the URL when clickingon the login button, eg: ".../login?destination=[token]..."

The lines of text at the bottom of the newsletter, especially the one that says "Click here to forward to a friend" should be lighter grey or white so that they are more readable.

Move the meta data to above the body and put embedded content into a floating DIV (allowing text to wrap) so that the body of the post can use that width.

I was trying to find a specific group and I knew the title somewhat. I didn't know the tags or the categorization, though, so when I tried to search for the group within the group page, it was difficult. I ended up searching the entire site. I found the organizing/searchable categories under Groups to be kind of confusing. Thanks for all you do!

could you please add an option to sort by post date so that we could view the most recent posts, and not the ones we've already read?

The text field for inputting tags is fairly short - long tags (like center names, university names, conference names) get cut off, and it's hard to see what you are selecting.