1 http://www.eetimes.com/design/analog-design?cid=NL_PlanetAnalog => Include some very good resource on analog circuit design. The “Also of interest” and “Elementals” section has very good resources on some fundamentals theory.
2. http://www.eetimes.com/ => Homepage for the first link. Cover virtually everthing from analog, RF&Microwave, programable logic, signal processing, test and measurement, source code, etc. A must read site !
3. http://www.edaboard.com/ => A very good place for circuit design related issue discussion. It covers EDA software, analog design, digital design, Hardware and PCB design.
4.http://webcast.berkeley.edu/course_details.php?seriesid=1906978451 => Online lecture on circuit design are available for view !
5. http://www.cmosedu.com/ => Another great online resource, include lectures and presentation slides.
6. http://spectrum.ieee.org/ => A free IEEE magazine. Covering area from aerospace, consumer electronics, biomedical, computing, etc.
7. http://ims.unipv.it/ => An excellent site by Laboratorio di Microsistemi Integrati (University of Pavia), led by Prof Franco Maloberti. Some very good free notes to download !
8. http://www.tkt.cs.tut.fi/tools/public/tutorials/synopsys/design_compiler/gsdc.html => A very good tutorial on Synopsys Design Compiler
Circuit Design World 