[JenB]

1. tarried in Arvernien?
Earendil

2. was the mother of Boromir and Faramir?
Finduilas

3. did in battle at the age of 252?
Dain Ironfoot, I think

4. walked in on Barley Butterbur without knocking?
Gandalf

5. searched the Bag End for treasure?
Two Bolgers and a Bracegirdle?

6. appeared to Frodo as a shining white figure?
Glorfindel

7. opened an ivory door with a crystal key?
Don't remember

8. found the One Ring while fishing?
Deagol

9. cast one of the Silmarils into the sea?
Maeglor

10. was sent by Cirdan on an errand to Rivendell?
Drat, I know this one...

[Fedora]

Wow, you got 70%! Here are the ones you missed:

> 5. searched the Bag End for treasure?
> Two Bolgers and a Bracegirdle?

Sancho Proudfoot.

> 7. opened an ivory door with a crystal key?
> Don't remember

The Man in the Moon.

> 10. was sent by Cirdan on an errand to Rivendell?
> Drat, I know this one...

Galdor.

Hmm, pretty good. Must ask it some harder riddles, my precious. . .