The Atom/Ray Palmer possesses the power to alter his size down to the subatomic level while retaining his natural strength level. This is accomplished by using the remnants of a white-dwarf star made into a belt buckle worn with his costume. The Atom is one of the only heroes in the DC Universe that has 100% control over his body on the molecular level (Plastic Man and The Flash being examples of others), thus making him exponentially more powerful than he is often portrayed; he is only limited by his application of his powers.
He has been shown to be able to ride phone lines to his destination by dialing a number and traveling through the handset (his signature use of his power), and recently shrinking small enough to travel on photon signals through fiber optic cable (Blackest Night #4).
Some of The Atom's more impressive feats include shrinking into Superman's bloodstream and manually rearranging his molecules to create Kryptonite and defusing Black Lantern Al Pratt's Atomic Punch and resizing within him, ripping his body apart in the process (Blackest Night #4).
He was a member of the Indigo Tribe, Ray possessed a indigo power ring powered by compassion, which provided him with flight, energy projection, and a protective force field. He also utilised a staff capable of duplicating the abilities of other wielders of the Emotional spectrum within range.
He has also shown the ability to allow others to shrink down with him if the situation requires it, such as when he shrunk himself, Superman, Flash, Green Lantern, Wonder Woman and Plastic Man to repair the links between seven shattered subatomic particles, or shrinking Steel, Supergirl and Superboy to directly treat a kryptonite tumor in Superman's body. However, this ability is relatively limited; initially anyone other than him who shrank would explode after two minutes, although he was later able to extend this time to around an hour.
http://en.wikipedia.org/wiki/Atom_%28Ray_Palmer%29#Powers_and_abilities
A transfusion of gamma-irradiated blood from her cousin Bruce Banner (the Hulk) granted Jennifer Walters superhuman powers. In her She-Hulk form, she possesses enormous superhuman strength, which even when calm makes her one of the strongest known women in the Marvel Universe.
Although She-Hulk's strength originally remained at a set level and did not increase, later in her history her strength has sporadically been stated to increase further from fear, or anger, similar to her cousin. In addition the character possesses superhuman speed, agility, stamina, and reflexes.
As She-Hulk, Walters is exponentially stronger than she is in her Jennifer Walters form; therefore any extra strength gained as Jennifer Walters through intense physical training will be amplified, making her She-Hulk form even stronger. After being defeated by the Champion of the Universe, She-Hulk exercised for several months in her Jennifer Walters form, resulting in a significant gain in strength and muscular mass in her She-Hulk form and allowing her to soundly defeat the Champion in a rematch. At this time she was able to effortlessly sustain the Thing's maximum weight with a single arm, while her strength was greatly restrained by a "Jupiter suit," and she was shown as considerably stronger than Hercules. Her base strength level has since receded.
She-Hulk's body is superhumanly durable and nearly impervious to force, pain, and disease: her skin can withstand extremes of temperature, as well as tremendous stresses and impacts without puncture wounds or lacerations. Despite this, she has been proven to be highly ticklish, as she was once tickled by the Hulk Robot during a battle. Her enhanced physiology renders her immune to all terrestrial diseases. She-Hulk also possesses a healing factor, which enabled her to completely recover, within minutes, from a skewering by the Wendigo.
Unlike Hulk, Jennifer's personality and intelligence are less affected when she transforms into She-Hulk, although she becomes more self-confident and assertive. For a long time, She-Hulk could not revert to her original human form.
http://en.wikipedia.org/wiki/She-Hulk#Powers_and_abilities
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