Some recent interviews with former Flash contributors:
Comics Worth Reading interviews Todd Dezago (who wrote Impulse for nearly half of the series’ 90*-issue run) about Perhpahanauts (co-created with art by
his Impulse collaborator artist Craig Rousseau**) moving from Dark Horse to Image.
Newsarama interviews Mark Waid (1990-2000) and William Messner-Loebs about the upcoming adapation of The Necronomicon. Messner-Loebs and Waid together account for 12 years of Flash stories from 1988–2000.
Edit: Mark Waid, William Messner-Loebs, and Todd Dezago actually cover the entire run of Impulse, minus a handful of fill-in issues by other writers.
*Yes, 90. The October 1998 issue was numbered #1,000,000 as a DC One Million tie-in.
**Correction: while Dezago and Rousseau both worked on Impulse, it was at different times. Rousseau worked on the book mainly with William Messner-Loebs.