Find $ f(x): (0,\plus{}\infty) \to \mathbb R$ such that \[ f(x)\cdot f(y) \plus{} f(\frac{2008}{x})\cdot f(\frac{2008}{y})\equal{}2f(x\cdot y)\] and $ f(2008)\equal{}1$ for $ \forall x \in (0,\plus{}\infty)$.
1. **Substitute \( x = y = 1 \) into the functional equation:**
   \[
   f(1) \cdot f(1) + f\left(\frac{2008}{1}\right) \cdot f\left(\frac{2008}{1}\right) = 2f(1)
   \]
   Given \( f(2008) = 1 \), we have:
   \[
   f(1)^2 + 1 = 2f(1)
   \]
   Let \( f(1) = a \). Then:
   \[
   a^2 + 1 = 2a
   \]
   Solving this quadratic equation:
   \[
   a^2 - 2a + 1 = 0 \implies (a - 1)^2 = 0 \implies a = 1
   \]
   Therefore, \( f(1) = 1 \).

2. **Substitute \( y = 1 \) into the functional equation:**
   \[
   f(x) \cdot f(1) + f\left(\frac{2008}{x}\right) \cdot f(2008) = 2f(x)
   \]
   Since \( f(1) = 1 \) and \( f(2008) = 1 \), we get:
   \[
   f(x) + f\left(\frac{2008}{x}\right) = 2f(x)
   \]
   Simplifying, we find:
   \[
   f\left(\frac{2008}{x}\right) = f(x)
   \]

3. **Substitute \( y = \frac{2008}{x} \) into the functional equation:**
   \[
   f(x) \cdot f\left(\frac{2008}{x}\right) + f\left(\frac{2008}{x}\right) \cdot f(x) = 2f(2008)
   \]
   Since \( f\left(\frac{2008}{x}\right) = f(x) \) and \( f(2008) = 1 \), we have:
   \[
   f(x) \cdot f(x) + f(x) \cdot f(x) = 2 \cdot 1
   \]
   Simplifying, we get:
   \[
   2f(x)^2 = 2 \implies f(x)^2 = 1
   \]
   Therefore, \( f(x) = \pm 1 \).

4. **Check the consistency of \( f(x) = 1 \) and \( f(x) = -1 \):**
   - If \( f(x) = 1 \) for all \( x \), then the functional equation holds trivially.
   - If \( f(x) = -1 \) for some \( x \), then \( f\left(\frac{2008}{x}\right) = -1 \) as well. However, this would not satisfy the original equation since:
     \[
     (-1) \cdot (-1) + (-1) \cdot (-1) = 2 \neq 2(-1)
     \]
   Therefore, \( f(x) = -1 \) is not a valid solution.

5. **Verify the multiplicative property:**
   - Given \( f(x) = 1 \) for all \( x \), we have:
     \[
     f(xy) = f(x) \cdot f(y) = 1 \cdot 1 = 1
     \]
   - This confirms that \( f(x) = 1 \) satisfies the multiplicative property.

The final answer is \( \boxed{f(x) = 1} \).