Without knowing what it is you want to do, it is difficult to say, but I'd avoid image-processing and large relational databases on the Arduino.
;D
Otherwise, go for it!
its a system that sends temperature and windspeed form on to an other module using a fast ntc to read the temp and a hall sensor to read the windspeed ( i need to make a table for this to convert pulses into m/s).
At the receiver side (wireless with the rfm12b) i want to display it on a 128x64 lcd with ks0108 controller. It needs to display wind and temp current and history (in a graph).
I saw that there are libraries for the rfm12b and ks0108