is there a good throw that flows nicely out of Osoto-gari when you end up kind of struggling with your opponent. There is that point in time when you know the throw hasn't gone according to plan, and you and your opponent are locked up, and you both have kind of the same grip and position. I usually just sort of "unwrap" my leg from behind his and get back to a more netural position, but I would rather throw him off of his resistance to my first attempt.
seionage works well off a failed osoto and vice-versa
This is a classic combination and a very common one.
Osoto gari to Harai-Goshi
You can also let your top Tsurite grip and just Makikomi it. Makes for a pretty nice fall.
Ouchi-Gari
i really like what Yama-Arashi said.
also if the person step back and out of the osoto you can try tani toshi (sp) if you reap there back leg while the other is up in the air its a really great throw. you can also try kosoto on the leg he is stepping back with..
lots of options try a few out and see what works best for you
good luck
Tjmitch: If "you and your opponent are locked up, and you both have kind of the same grip and position", then osoto-osoto is a good choice. Leave your leg wrapped, let you lapel-grip arm slide up over his shoulder right to your shoulder as you step back and pivot 60-90 degrees. Simultaneously pull strongly with your sleeve grip arm, then reap. He should land on a 90 plane from original stance.
O Soto Gake if foot still wrapped. If unwrapped Harai Ogoshi or Koshi Garuma possibly.
I would just add that the locked-up double-osoto position is very dangerous. Usually whoever switches first to harai-goshi or soto-makikomi wins a big crashing ippon.
If my opponent is significantly stronger or has a better makikomi or harai than I do, I usually just get out of there, fast.
One combo not mentined is nidan kosoto gari/gake.
If you are locked in right side, put down your right foot on the mat and step around with your left foot, attacking his left leg with kosoto.
Another trick is to put your wrist under his chin and roll your wrist/forearm to the rear. That will put his head back so you can finish the throw, which was the problem in the first place most likely.
Ben R.