2/15/09 Psalm

RCL reading for Sunday, February 15, 2009:
Excerpt from The New Revised Standard Version
via Oremus (http://bible.oremus.org)

Psalm 30
1 I will extol you, O Lord, for you have drawn me up,
and did not let my foes rejoice over me.
2 O Lord my God, I cried to you for help,
and you have healed me.
3 O Lord, you brought up my soul from Sheol,
restored me to life from among those gone down to the Pit.

4 Sing praises to the Lord, O you his faithful ones,
and give thanks to his holy name.
5 For his anger is but for a moment;
his favour is for a lifetime.
Weeping may linger for the night,
but joy comes with the morning.

6 As for me, I said in my prosperity,
‘I shall never be moved.’
7 By your favour, O Lord,
you had established me as a strong mountain;
you hid your face;
I was dismayed.

8 To you, O Lord, I cried,
and to the Lord I made supplication:
9 ‘What profit is there in my death,
if I go down to the Pit?
Will the dust praise you?
Will it tell of your faithfulness?
10 Hear, O Lord, and be gracious to me!
O Lord, be my helper!’

11 You have turned my mourning into dancing;
you have taken off my sackcloth
and clothed me with joy,
12 so that my soul may praise you and not be silent.
O Lord my God, I will give thanks to you for ever.

QUESTIONS:
This psalm is in thanksgiving for recovery from a grave illness, but it is also listed as a song at the dedication of the Temple of David. Can anyone provide some background on that?
In verse 1, who are the "foes"?