Here are some links of sites I frequent and love!
Allkpop – portal for all things k-pop related.
Asianfanatics – aggregates news of Asian entertainment from all over – particularly China/Hong Kong/Taiwan
Dramabeans – awesome site for K-entertainment news and recaps.
DramaFever – best place to watch K-dramas in high quality legally. Think Asian Hulu.
Gummimochi – expand your palate in all things Korean music!
Soompi – a place to discuss, discuss, discuss with fans!
WithS2 – fansubbers unite in one of the biggest fansubbing groups for K-dramas out there!