I know this resource has been mentioned before but I hadn't bothered with it until a friend told me that it had given him a good lead.
For those who don't know, Lost Cousins is a site where you enter some detail about your ancestors that appear in the 1881 Census and get an automated search to see whether anyone else has registered interest in the same people. Presumably the Lost Cousins people chose 1881 because the transcriptions are on-line and free.
You register for free membership and there's no charge unless you want to subscribe (see below).
You need to enter the Piece, Folio, Page Number and surname (all these once for each household), then just forename, age and relation for the rest of the family. You specify relation as direct ancestor, blood, marriage or unknown. For direct ancestors you need to work out the AFN number (not difficult). It's important that you enter info as it appears in transcriptions, i.e. not your own interpretation from an image. This is to ensure consistency and accurate comparisons between different members' info.
You don't see what others have entered and they don't see your data. Matches are highlighted to both parties. One party need to subscribe in order to make first contact (contact is via Lost Cousins - e-mail addresses not revealed unless both parties agree). Subscription is £10 for a year.
I entered about 180 names (over a few days - it is a bit tedious) and got hits on two families, both related by marriage to my family tree. One of these was a member in the UK and they contacted me (i.e. they must be a subscriber). We exchanged info and e-mail addresses. The other (a member in the US) is sitting there without response - I guess the other party isn't subscribing (or isn't visiting the site to check for hits). For now, it isn't worth a subscription to me but I can check it every now and then and if a promising hit shows up (e.g. direct ancestor) then it might be worth the £10.
EDIT: That second hit also turned out to be a member and made contact. We have since exchanged useful info.
The message is that it's one of those resources that gets better the more people that use it so I would recommend it to anyone who can find the time to enter their info. It can yield good results (if you're lucky!) at no cost.
The site is
www.lostcousins.comSherwood.