Hayami Sho's first anime roles was Thief of Millennium in Queen Millennia Movie
(1892). It was the first and the only time when he used his real name - Ohama Yasushi
Futher in 1892 he took part in two more anime TV-series: Kikou Kantai Dairugger XV
(Hayami as Izumo Tatsuo) and The Super Dimension Fortress Macross
(as Maximilian Jenius).
There is a drama where he'd played for all characters. Yes, a complete monologue. The drama's called Kankin no Yakata (2004 year, JCD-040501). 
Among another roles, fans usually recommend listening to S.S.D.S.: events, drama cds, vocal albums, games, web radio...  Lots and lots of Hayami. :) And of course other great seiyuus take their part too, such as Chiba Susumu, Fukuyama Jun, Morikawa Toshiyuki, Seki Toshihiko and etc.
And the last but not the least, I cannot omit his brilliant work with Seki Toshihiko in Mirage of Blaze (炎の蜃気楼) Drama CDs.
GAME S.S.D.S. (Super Stylish Doctor Story) ~Setsuna no Eiyuu (Akogare)~
is a shounen-ai computer game developed by STACKSoftware and released in 2005 in Japan. Japanese title: GAME S.S.D.S.（スーパースタイリッシュドクターストーリー）～刹那の英雄（あこがれ）～. Genres: shounen ai, comedy, sci-fi. More information in japanese
. There's also CG guide
available (in japanese).
New trainee arrives in a gigantic intergalactic hospital - obviously, very talented young man. He's shy, not sure of his abilities and wonders if he could become a worthy part of this hospital. But he receives a good welcome from the other 12 doctors, all of them are really attractive and easy going. The problem is that he's 13th, which is unlucky number, and alarming events're going to develop soon. 
List of notable voice roles:
- Ai no Kusabi (Raoul Am)
- Basilisk: The Kouga Ninja Scrolls (Yakushiji Tenzen)
- Buso Renkin (Showusei Sakaguchi)
- Bleach (Aizen Sosuke)
- Chrono Crusade (Father Ewan Remington)
- Dragon Ball Z (Zarbon)
- Fullmetal Alchemist (Frank Archer)
- Gravion and Gravion Zwei (Klein Sandman)
- Hellsing Ultimate OVA (Enrico Maxwell)
- Macross Plus (Marge)
- Macross 7 (Maximilian Jenius)
- Mirage of Blaze (Naoe Nobutsuna)
- Mobile Suit Gundam: The 08th MS Team (Ginias Saharin)
- Record of Lodoss War (Orson)
- Saint Seiya (Sea Horse Baian)
- RG Veda (Ashura-oh)
- Trigun (Nicholas D. Wolfwood)
- Yami no Matsuei (Kazutaka Muraki)
- Yakitate Japan (Meister Kirisaki)
- Zetsuai 1989 (Koji Nanjo)
For more roles, please visit ANN page.