Solution:
(1) From $S_n+S_{n-2}=2S_{n-1}+2$ (for $n\geq3$), we know that $S_n-S_{n-1}=S_{n-1}-S_{n-2}+2$,
Therefore, $a_n=a_{n-1}+2$, which implies $a_n-a_{n-1}=2$ (for $n\geq3$).
Since $a_2-a_1=2$,
it follows that $a_n-a_{n-1}=2$ (for $n\geq2$),
Therefore, $\{a_n\}$ is an arithmetic sequence.
(2) From (1), we know that $a_{n}=2n+1$, thus $b_{n}= \frac {2n+1}{3^{n}}$,
Therefore, $$T_{n}=b_{1}+b_{2}+\ldots+b_{n}=3\times \frac {1}{3}+5\times \frac {1}{3^{2}}+\ldots+(2n+1)\times \frac {1}{3^{n}}$$  (1)
$$\frac {1}{3}T_{n}=3\times \frac {1}{3^{2}}+5\times \frac {1}{3^{3}}+\ldots+(2n+1)\times \frac {1}{3^{n+1}}$$  (2)
Subtracting (2) from (1) gives: $$\frac {2}{3}T_{n}=3\times \frac {1}{3}+2\times \frac {1}{3^{2}}+2\times \frac {1}{3^{3}}+\ldots+2\times \frac {1}{3^{n}}-(2n+1)\times \frac {1}{3^{n+1}}$$,
Therefore, $$\frac {2}{3}T_{n}= \frac {1}{3}+2\left( \frac { \frac {1}{3}(1- \frac {1}{3^{n}})}{1- \frac {1}{3}}\right)-(2n+1)\times \frac {1}{3^{n+1}}= \frac {4}{3}- \frac {1}{3^{n}}-(2n+1)\cdot \frac {1}{3^{n+1}}$$,
Therefore, $$T_{n}=2-(n+2)\cdot \frac {1}{3^{n}}$$.

Thus, the answers are:
(1) $\boxed{\text{The sequence } \{a_n\} \text{ is an arithmetic sequence.}}$
(2) $\boxed{T_{n}=2-(n+2)\cdot \frac {1}{3^{n}}}$