What's new in WA State? Q1 2024

I like to skim through the websites for WA DOR, L&I, Employment Security and related programs each month to keep up on what's new. Let's do it together for Q1.
Here are a few of the links mentioned:
dor.wa.gov/abo... - sales tax rate updates (also informational videos and other updates)
ucp.dor.wa.gov/ - unclaimed property
dor.wa.gov/tax...
wacaresfund.wa...