For example, this links to the abstract for PMID 12748199:
http://pmid.us/12748199
Compare that to the equivalent but much longer direct link to PubMed:
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=retrieve&db=pubmed&list_uids=12748199&dopt=AbstractPlus
(Learn more about linking directly to PubMed.)
Get abstracts for both PMID 2676911 and PMID 6189501:
http://pmid.us/2676911+6189501
Get the full text article for PMID 10221304:
http://pmid.us/full:10221304
Full text retrieval priority:
PMC > publisher (free) > FindArticles > publisher (fee) > abstract
Get related articles for PMID 10221304:
http://pmid.us/rel:10221304
Search for anything (you must escape non-url-friendly characters):
http://pmid.us/alopecia+minoxidil
http://pmid.us/(alopecia+OR+baldness+OR+%22hair+loss%22)+AND+(tnf-alpha+OR+tgf-beta)