IFR PA-34 at 8000 FT; with P31; encountered weather buildups; requested and was granted an amended route; after hand off to VPS reporter was questioned regarding restricted airspace entry.

Narrative

I was on an IFR flight plan from the west at 8000 FT. As I approached Pensacola; a line of buildups required deviation. While under the direct control of Pensacola ATC (frequency 118.6); the Controller vectored me to a location just north of Pensacola. From there; the Controller advised that the route was clear and asked if I wanted direct Tallahassee from present position. I accepted that and read it back. I then turned direct to Tallahassee (Seminole VOR). I remained under ATC control and on the same frequency until just passed Eglin. At that time; ATC called and asked 'Are you still with me?' to which I replied 'Of course.' I was advised to contact Eglin Approach 133.1. I immediately contacted Eglin. The Controller was clearly agitated. The transmissions were as follows: ATC: 'Are you familiar with the area.' Aircraft: 'No sir; but what can I help you with?' ATC: 'You just flew right through restriction airspace at Eglin; I've been trying to call you for 20 miles.' Aircraft: 'I am on an IFR flight plan and on my assigned clearance.' ATC: 'Who were you talking to?' Aircraft: 'Pensacola Approach on 118.6. ATC gave me present position direct Tallahassee. I was north of Pensacola.' ATC: 'Why didn't you call her when the Controller didn't given you a handoff?' Aircraft: 'The Controller was extremely busy and I was patient with her.' Here; Pensacola missed a handoff. But rather than confirm with Pensacola Approach; this irate Controller decided instead to argue about it. As a pilot; I have no way of knowing where an ATC handoff is appropriate. I can only presume the Controller knows A) to keep me out of controlled airspace; and B) clearance to 'Tallahassee' was presumed to be the VOR; (now renamed Seminole VOR). While this made no significant difference in path; I presumed the Controller meant the VOR and not Tallahassee Airport's aerodrome. Finally; due to the buildups all along my path; my altitude deviated possibly 100-200 FT due to updrafts.