If you want to do some subject browsing, nothing beats a good ejournal collection.

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Multidisciplinary eJournal Collections

   Annual Reviews

Directory of Open Access Ejournals

  EBSCOHost Journals

Gold Rush
Via Colorado Alliance of Research Libraries

  Emerald Fulltext   (Select titles only)

  JSTOR Online Journals  (Select titles only)

NewJour: Electronic Journals and Newsletters

  Project Muse  (Select titles only)

  Wiley InterScience  (Select titles only)

Specific Subject eJournal Collections

Biology:
Biomedicine Electronic Journals
  BioOne

Chemistry:
  American Chemical Society Journals

History:
   History Cooperative

Medicine:
FreeMedicalJournals.com
HighWire Press -- Free Online Full-text Articles (Articles from over 80 journals in the natural sciences. Particular emphasis on journals in biology and medicine.)

Sciences:
CiteSeer: Scientific Literature Digital Library
GrayLit Network (Scientific government reports.)
NASA Technical Reports Server (Astronomy, Aeronautics, Astrophysics.)
PolySearch: Energy
PrePrint Network (Energy, science and technology)