Other pools hold the coins you earn and distribute them as you hit your payout threshold, the only time eligius does this is when it is in failsafe mode to prevent mining from shutting down. Here they payout out people using the generation transaction, much like p2pool does, only eligius doesn't pay you each block, but when you've hit the payout threshold, you enter the payout queue. The payout queue is then paid from the person who hasn't received a payout the longest, then the next, etc. until it has paid out 25 BTC + transaction fees. Whoever is left gets pushed to the next block etc. Right now it looks like you need to be 2 1/2 days old to hit the current payout block.