ExPASY is also the answer! ExPASY is a tool a lot of scientists use to do protein predictions (especially preliminary analysis) http://www.expasy.ch/tools/
First you'd have to take your cDNA sequence and put it into one of the translation tools (DNA -> Protein links from the ExPASY site above).
I like the "Translate" tool.
Once you have the protein sequence, copy and paste that sequence into one of the "Pattern and Profile" tools. I like Motif Scan. You can try the others too.
Alternately, you can use BLAST (under "Similarity Searches") to see if your protein is already identified and has clearcut domains already available in the databases.
Hope that's something of what you're looking for.