The ArXiv: The famous e-print ArXiv for physics publications. Most recent publications can be found in fulltext here.
Scientillion.com - ArXiv and Physics Search: Usefull Search Engine for scientific publications. Searches various databases like the famous e-print ArXiv.org or the PubMed repository. Plenty of Open Access documents can be retrieved within a second.
PubMed - MEDLINE Database: A huge collection of abstracts and citations from life and bio sciences. Contains more than twenty million articles from that field.
Epub to PDF: A really usefull converter which also works online similar to this one.
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