See also:

• Science: Math: Research: Open Problems  (5)

The Boise Problem Book: - Problems in combinatorial set theory and topology, collected by Marion Scheepers.

Kirby's Problem List in Low-Dimensional Topology: - Problems list in PostScript format.

Open Problems in Topology: - Collection includes problems in set theory, continua, algabraic structures, analysis, and dynamics. Page includes glossary of terms. Links are in PDF.

Thrackle.org: - John Conway's Thrackle Conjecture: a compilation of what is known about the question.