Getting into Analog Design/Electronics
'Getting Started in Electronics,' Forrest Mims - was quite good in my beginning exploration days (if you want to start building around a breadboard).

From a simulation perspective, any intro text bundled with a free SPICE version (or if not, there are several free versions via web search) is a good start.

'PSPICE and circuit Analysis', Keown - good one.

'The SPICE BOOK,' Vladimirescu - another (slightly more advanced and covering more broad versions of spice).

Aside from the very classic, Horowitz and Hill mentioned, those are good primers - H&amp;H like Mims, is also very hardware oriented vs. simulation. Depending on your level, I would argue Mims is the gentlest intro.