The best replacement for slides is negatives.

The best alternatives to slides are rated as following:
★★★★★  negatives
★★★  mules
★★★  sandals
★★  flip flops
★  swings
★  prints
★  clogs
★  ball bearing
★  wet mount
  leukemia slides
  blum
  transparencies
  adidas slides
  drawer glides
  guides
  no slides

Your alternative for slides is not listed? Suggest!
Speaking about slides, one probably shouldn't forget about notes.

Other search terms related to slides and their ratings are:
★★★★★ notes
★ climbing frames
★ notes in powerpoint
★ pools
hp scanners
notes on side
different designs in powerpoint
You have in mind a companion for slides and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of slides in all years. Click on graph for more.
slides
negatives
mules