This list only briefly touches upon seva in our community, so please let me know if you come across any others of interest, and i will add them to this post.
ਇਤੁ ਤਨਿ ਲਾਗੈ ਬਾਣੀਆ ॥ ਸੁਖੁ ਹੋਵੈ ਸੇਵ ਕਮਾਣੀਆ ॥
"It tan laagai baanee-aa, sukh hovai sayv kamaanee-aa"
"This body is softened with the Word of the Guru's Bani, you shall find peace, doing seva (selfless service)."
- Sri Guru Granth Sahib, Page 25.
- -Labour of love (Gallery 1/Khar Seva):
http://www.labouroflove.org.uk/
Punjab & Health and Human Rights:
http://punjab-healthandhumanrights.blogspot.com
Amritsar AIDS Awareness Group (AAG):
http://aagamritsar-bharti.blogspot.com/
Ensaaf News Blog:
http://blogs.law.harvard.edu/jaskaran/
Sewa:
http://sangatdeseva.blogspot.com/
Into the Worldwind:
http://valariekaur.blogspot.com/
J.Korps:
http://jakara.blogspot.com/
SevaCentral:
http://www.sikhnet.com/s/seva
Seva:
http://www.sikhiwiki.org/index.php?title=Sewa
The Sikh Coalition:
http://www.sikhcoalition.org/default.asp
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Also, make sure to check out the link below on 1984 / Sikh Genocide which profiles more organizations doing seva.