The polyurethane upper shock bushings in my Cherokee settled 1/8" or so after a few thousand miles. Might be worth cranking the top caps down nice and tight and checking the bottom bushings for play.

Doubt thier blown if you've just be driving on pavement. Even my $25 Skycrackers lasted 2 years off roading.

It's pretty easy to damage one of the rear shocks backing into stuff off road. The other is in front of the axle so hard to hit. Again, if your on pavement I doubt you've bent a shock.
Could be one or more worn steering components are making your ride rougher than usual.
Might try shaking the front tires while thy're off the ground to see if they rattle or have any play.
Loose track bar, pitman arm, ball joints,wheelbearings, steering stabilizer, can all cause rough handling or even the dreaded Jeep Death Wobble <img src="/forums/images/graemlins/evil.gif" alt="" />

Been there, super sucks to hit a pothole and start fishtailing wildly at 45MPH in thick traffic. <img src="/forums/images/graemlins/scared.gif" alt="" />