Genealogy data website Findmypast is having a free weekend this weekend! It started as a UK-focused site, so it's particularly strong for British and Irish ancestry research, but it also has branched out into US records.
Free access runs from 7 a.m. Eastern on Friday, Sept. 18, to 7 a.m. Eastern on Monday, Sept. 21. You'll need to set up a free basic registration (or log in if you already have one) to get started—use the Sign Up Now button on the Free Weekend Landing page.
Findmypast has US and British censuses; newspapers from the United States, England, Ireland and elsewhere; the Periodical Source Index, aka PERSI (with some results linked to digitized article images); British and US military records and directories; and Irish resources including poverty relief loan and petty sessions records.
Looking for help finding your ancestors' record on Findmypast? Family Tree Magazine's Findmypast Web Guide is available as a download from ShopFamilyTree.com—so you can start using it right away.