New answers:
+Label includeother:LaTeX refuses to \include from (some) other directories
Relabelled answers:
<none>
Revised answers:
+Label acrobat: Rearranged and extended somewhat (dropped V-TeX details)
+Label bibinline: Outline use of the new usebib package
+Label citesort: Show how to do the job with biblatex
+Label cmdstar: Suggest use of xparse for *-commands
+Label crossref: Clarified wording, and removed incorrect "effect" of error
+Label eqnarray: Added link to Stefan Kottwitz blog entry on the problem
+Label euro: Updated note about using marvosym font
+Label extrabrace: Some clarification (and a new solution)
+Label filesused: Discuss mkjobtexmf
+Label findfont: Rewritten, downplaying Metafont and covering TTF and OTF
+Label footintab: Discuss tablefootnote package
+Label i18nbib: BibLaTeX is another candidate
+Label inlgrphapp: Add picture environment to list, mention picture package
+Label isitanum: Improve \testnum definition
+Label labelfig: Describe pinlabel package
+Label man-latex: Correct link to Chris Harrison's (now) tutorial;
Mention van Dongen's, Wilkins' and Buxbaum's offerings
+Label marginpkgs: Discuss zwpagelayout
+Label mfptutorials:Restore (lost) link to MetaFun manual
+Label noroom: Mention morewrites for lots of (pretend) output streams
+Label papergeom: Outline use of zwpagelayout package
+Label ref-doc: Added reference to macros2e document
+Label slashbox: Recommend diagbox package in preference to slashbox
+Label syswin32: Miktex 2.9 no longer beta ... so catch up!
+Label tutbitslatex:Rearrange stuff on pgf/tikz, after new management of site
+Label tutorials*: Changed question title to "... TeX-based systems"
+Label usesymb: Add fdsymbol, mdsymbol
+Label verbwithin: Suggest "v" argument type of xparse
+Label watermark: Discuss xwatermark and use of pdftk
+Label whatengine: Sort out erroneous wording, correct HTML of example code
