..web-based tool to search Medline at the abstract level (available from http://twease.org). Twease indexes each word of Medline and provides features that can transparently expand your search to help find the information you are looking for.
Twease searches are also partially case sensitive. Short terms are case sensitive, while longer terms are not. For instance, TnT is different from TNT (TnT often stands for Troponin T while TNT often stands for trinitrotoluene). For more details on Twease’s case sensitivity, see the Case Sensitive Searches tutorial page.
Finally, Twease can automatically discover common abbreviations for search phrases (e.g., “protein kinase C” will discover PKC, PK-C, aPKC, etc.) and rewrite queries to use these abbreviations. This feature is available through the Slider (on the top right) and the Advanced pane.
I like the way you can save an individual references to a list that can be exported to BibTeX or EndNote.
Still, I’m not entirely clear on when Twease would actually be preferable to PubMed’s native interface. Would I pretty much save it for when I need to write a query that uses abbreviations or case-sensitive terms?
The Twease project home page includes sources, binary and other information.