In the time of semantic web, people are no longer satisfied with just finding something. You need a ‘librarian’ who can help you to organize what you try to find. Such as, Categorizing journal papers in some well-established topics, the authors who are usually the expert in this field, and Journals which usually cover the cutting-edge research about this problem.
Furthermore, it is really time-consuming and inconvenient for us to check all those journals one by one. We need a search engine which could cover APS journals, European Physics Journals and UK IOP journals. Even with ArXiv, ScienceDirect and SCOPUS, semantic web searching is still a welcomed gadget for physicists.
The SCITopia is right choice for physicists:
http://www.scitopia.org
Fig. 1 website of SCITopia
Biology
Just like Physics Review serial for physicists, PubMed is the most important source for biologists. So GoPubMed is the right choice for biologists.