Seashore is one of the few PhotoShop alternatives that has all the features I need, and I've been very happy with it so far. I love, love, love the simple keystrokes for getting some or all of the palates out of the way. Tools seem more intuitive and easier to use than in my ancient copy of PS7. It may not have every bell and whistle, but it does everything I need.

Only 2 problems so far:

1) Lassoing sometimes causes LONG spinning-beachball pauses.

2) If the last update was 11 months ago, I'm worried I've just fallen in love with abandonware.