Don't feel too bad about being newly diagnosed. Now that you know you have ADHD, you can actually treat the symptoms of it. You have a name to go along with the symptoms that are interfering with your life.

I encourage you to try changing doses and try different medications if you find the Ritalin isn't working for you or has too many side effects. There is a large myriad of different kinds of drug treatments for ADHD symptoms, and don't forget that a good therapist with skill in treating adult ADHD is really helpful (if you don't already see a therapist).

I haven't found any resource for us adults that is comprehensive or "best" in a helpful sense, but I've found a few online ones that are not bad.

CHADD-Children and Adults with Attention Deficit Hyperactivity Disorder
-a not bad online resource:
http://www.chadd.org/
The National Resource Center on ADHD (a program of CHADD):
http://www.help4adhd.org/
For strategies in coping with ADHD, this link is good:
http://www.helpguide.org/mental/adhd...strategies.htm
Understanding adult manisfestations of symptoms of ADHD:
http://www.helpguide.org/mental/adhd...t_symptoms.htm
Decent descriptive page from a Canadian L.D. website:
http://www.ldac-taac.ca/InDepth/adhd_07-e.asp
A slightly more "academic" article (written for GP's) but has good info.:
http://www.aafp.org/afp/20001101/2077.html
Decent article on how various medications work on ADHD brains:
http://www.baltimorepsych.com/Stimulants.htm
A little ADHD humor:
http://www.addresources.org/article_adhd_humor.php
Good letter turned into an article by an "older" ADHD lady:
http://www.addresources.org/article_..._zimmerman.php

Education is one of the best things you can do.