I am currently playing as fifth in a fairly optimized and balanced party. I used the above guide for building a support character. My original intention was to build a character capable of trapping, with high UMD and the ability to buff/debuff. However, the advice in that guide led me to develop a toon for whom the buffing is so dramatically effective that trapping and UMD have actually become of secondary importance. Plus, when not in combat, this character really shines, as well, with plenty of social skills and bardic knowledge bonuses.
I am playing a CG Mousetouched Aasimar, and for the first 12 levels I went 2 Rogue/10 Bard. The suggestions for maximizing Inspire Courage were so good that I effectively reached a theoretical maximum for the Inspire Courage buffs (at least using Pathfinder rules/items without digging into 3.P stuff) at +8/+8+1d6 sonic, using Aasimar racial bonuses to bard levels, Flagbearer, Performer/Master Performer, Banner of the Ancient Kings, and Discordant Voice feats/gear. Inspire Courage bonuses seem to cap out at Bard Level 17. Oh, and using the suggestions in that guide, and a coupe of items, I currently have +17 to initiative, so I always act early in the round!
Grease, Create Pit and Web wands, and Silent Image have been fun and suitably chaotic. Plus, I can do some spot healing with scrolls/wands as needed. However, it's the Inspire Courage that has really shined. The impact has been so dramatic, that the DM has had to scale CR levels up to provide a challenge for us. :D
To continue scaling buffs and supporting the real damage dealers in the party, I have decided to take Honor Guard Cavalier for levels 13-15. With Order of the Dragon bonuses, I can share a teamwork feat (e.g., Outflank or Precise Strike) and provide flanking bonuses augmented by Tactical Acumen for hard-to-hit opponents. I will use Summon Monster 3 to summon level 2 small elementals to provide the flanking, as needed (with Haste and Inspire Courage bonuses, they might even hit occasionally). I will use my attacks to Aid Another (AC 10 is a realistic option for melee attacks, as opposed to the often 40+AC we're fighting at these levels), and with Combat Reflexes and the auto-granted Bodyguard feat, I can provide several additional Aid Another every round to provide bonuses to allies' AC as attacks of opportunity. I will also be able to provide some small additional buffs with one Challenge/day.
The remaining five levels I plan to use to provide more survivability for myself, as I tend to draw some aggro b/c of all the benefits I'm providing. Currently I rely on evasion, Bestow Grace scrolls, Shield wands, Blur/Displacement, Mirror Image, and/or Blink. AC is currently about 30 fully buffed, which means I'm pretty easy to hit and saves are kind of mediocre, even when Bestow Grace is adding CHR to all saves. I am taking the Leadership/Monstrous Companion feat at level 13 with Cavalier to obtain a cool mount (e.g., Lammasu at level 14), so I will take some levels of Dragoon Fighter to buff my mounted effectiveness and some levels of Paladin of Freedom for Divine Grace, Lay on Hands (10/day), and Smite Evil 1/day for CHR to AC.
It's been a great support character and a ton of fun to play--really versatile and full of situationally-useful tactics. This utility build is really only limited by your own creativity and the tendency of your GM to try to preserve level appropriate game balance because of the dramatic effects of your awesomeness!